Condensed reference manual for the Fenix BC05R V2.0 ultra-compact rechargeable bicycle taillight.

<p>See the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc05r-v2-0-rechargeable-bicycle-tail-light">the product page</a> for complete details.</p><h4 id="overview">Overview</h4><ul><li>15 lumens maximum output; 50 meters alerting distance</li><li>180&#xB0; lighting angle</li><li>5 red light LEDs</li><li>Built-in 400mAh Li-polymer battery</li><li>USB Type-C charging port</li><li>Ultra-compact and fashionable appearance</li><li>Battery level indication for checking remaining battery level</li><li>Single switch for easy and fast control</li><li>Matched with the body clip, can be used as a backpack light and chest light</li><li>Size: 2.01&apos;&apos; x 0.87&apos;&apos; x 0.87&apos;&apos; / 51 x 22 x 22 mm. Weight: 0.99 oz / 28 g (including battery)</li></ul><h4 id="operating-instruction">Operating Instruction</h4><p><strong>On/Off:</strong> press and hold the switch for 0.5 seconds to turn the light on/off.</p><p><strong>Output Selection:</strong> with the light switched on, single click the switch to cycle through Low &#x2192; Low Flash (slow) &#x2192; Low Flash (fast) &#x2192; High &#x2192; High Flash (slow) &#x2192; High Flash (fast).</p><h4 id="charging">Charging</h4><p>Remove the dust cover of the bicycle taillight to reveal the charging port, and plug the USB Type-C end of the charging cable into the light&apos;s charging port, then connect the other end to a USB power adapter. The indicator displays red while charging and turns green when fully charged.</p><h4 id="battery-level-indication">Battery Level Indication</h4><p>With the light switched off, single click the switch to check the battery status; the indicator shows the status for 3 seconds: green on (saturated, 100&#x2013;85%), green flashing (sufficient, 85&#x2013;50%), red on (poor, 50&#x2013;25%), red flashing (critical, 25&#x2013;0%).</p><h4 id="technical-parameters">Technical Parameters</h4><ul><li><strong>High Flash (Fast) / High Flash (Slow) / High:</strong> Output 15 lumens, Intensity 9 candela &#x2014; Runtime 35 hours / 25 hours / 4.5 hours respectively</li><li><strong>Low Flash (Fast) / Low Flash (Slow) / Low:</strong> Output 5 lumens, Intensity 3 candela &#x2014; Runtime 120 hours / 80 hours / 16 hours respectively</li></ul><p>Alerting Distance: 50 meters &#xA0;|&#xA0; Lighting Angle: 180&#xB0; &#xA0;|&#xA0; Impact Resistance: 1.5 meters &#xA0;|&#xA0; Submersible: IP66</p><p><em>Note: Specs measured by Fenix using one 400mAh Li-polymer battery at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies.</em></p><h4 id="low-voltage-warning">Low-Voltage Warning</h4><p>When the voltage level drops below 25% of the total level, the battery level indicator blinks red to remind you to recharge in a timely manner. The light will not turn off automatically and will keep working until the battery runs out.</p><h4 id="mounting-instruction">Mounting Instruction</h4><p><strong>Mounting strap:</strong> loop the strap (without LOGO) around the taillight&apos;s small opening and place the taillight on the seat post face up, then loop the other end (with LOGO) around the taillight&apos;s other small opening and adjust to the seat post&apos;s size.</p><p><strong>Body clip:</strong> with the body clip and taillight both face up, push the small opening on both sides of the taillight downward onto the spout of the body clip.</p><p><em>Note: applicable to bike seat post diameters between 20mm and 35mm.</em></p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed head can cause damage and will void the warranty.</li><li>Recharge the light promptly when the battery level is critical.</li><li>Recharge a stored light every 3 months to maintain optimal battery performance.</li><li>Periodic cleaning helps if the light flickers, shines intermittently, or fails to illuminate due to a poor battery level &#x2014; recharge or replace the battery.</li><li>If issues persist, contact your authorized distributor.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC05R V2.0 bicycle taillight, taillight mounting strap, body clip, Type-C charging cable, user manual, and warranty card.</p>

Fenix BC05R V2.0 Reference Manual

Condensed reference manual for the Fenix BC06R smart-brake bicycle taillight.

<p>The Fenix BC06R is a smart-brake bicycle taillight. This summary is drawn from the manufacturer&apos;s official user manual &#x2014; see the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc06r-smart-brake-bicycle-taillight" class="fr-strong">the product page</a> for complete details.</p><h4 id="warning">Warning</h4><ul><li>The taillight is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the light directly into anyone&apos;s eyes.</li><li>The LED of this light is not replaceable; the light will need to be replaced when the LED reaches the end of its lifespan.</li></ul><h4 id="overview">Overview</h4><ul><li>Smart brake sensing function &#x2014; Braking output is 90 lumens with a 100-meter alerting distance</li><li>Can be mounted on saddle rails or seatposts, with a quick-release structure for fast assembly/disassembly</li><li>Built-in 560mAh battery, USB Type-C charging</li><li>270&#xB0; lighting angle; multiple lighting modes to choose from</li><li>Battery level indication; single-switch operation</li><li>Size: 1.50&apos;&apos; x 1.50&apos;&apos; x 1.50&apos;&apos; / 38 x 38 x 38 mm (excluding mount). Weight: 1.57 oz / 44.5 g (including battery)</li></ul><h4 id="operating-instructions">Operating Instructions</h4><p><strong>On/Off:</strong> press and hold the switch for 0.5 seconds to turn the light on/off.</p><p><strong>Output Selection:</strong> with the light switched on, single click the switch to cycle through (Low) Constant-on &#x2192; (Low) Slow flashing &#x2192; (Low) Fast flashing &#x2192; (High) Constant-on &#x2192; (High) Slow flashing &#x2192; (High) Fast flashing &#x2192; Spinning.</p><p><strong>Mode Switching:</strong> a sudden reduction in riding speed automatically triggers Braking mode; after two seconds the light recalls the previously used output. The light also memorizes the last selected output (excluding Braking) for next time it&apos;s turned on.</p><h4 id="charging">Charging</h4><p>Turn off the light, open the anti-dust cover to reveal the USB Type-C port, and connect the charging cable. The indicator displays red while charging and turns green when fully charged &#x2014; be sure to close the anti-dust cover afterward to maintain dust/water resistance. A full charge from depleted takes about 2 hours; recharge a stored light every four months to maintain optimum battery performance. The Constant-on Low mode can be operated while charging, but this prolongs the charging time.</p><h4 id="battery-level-indication">Battery Level Indication</h4><p>Each time the light is turned on (or via a single click while off), the indicator shows the battery status for 3 seconds: green on (saturated, 100&#x2013;85%), green flashing (sufficient, 85&#x2013;50%), red on (poor, 50&#x2013;25%), red flashing (critical, 25&#x2013;1%).</p><h4 id="technical-parameters">Technical Parameters</h4><ul><li><strong>Spinning:</strong> Output 10 lm, Runtime 22h, Intensity 5 cd</li><li><strong>Low (Constant-on / Slow flash / Fast flash):</strong> Output 10 lm, Intensity 5 cd &#x2014; Runtime 12h30m / 14h30m / 24h30m respectively</li><li><strong>High (Constant-on / Slow flash / Fast flash):</strong> Output 30 lm, Intensity 15 cd &#x2014; Runtime 5h / 5h / 8h respectively</li><li><strong>Braking:</strong> Output 90 lm, Intensity 30 cd</li></ul><p>Alerting Distance: 100 meters &#xA0;|&#xA0; Lighting Angle: 270&#xB0; &#xA0;|&#xA0; Impact Resistance: 1.5 meters &#xA0;|&#xA0; Waterproof: IP66</p><p><em>Note: Specs measured by Fenix using one built-in 560mAh battery at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies.</em></p><h4 id="low-voltage-warning">Low Voltage Warning</h4><p>When the voltage drops below 3.0V, the light downshifts to a lower brightness level and the battery indicator blinks red at 3Hz. The light will not turn off automatically and will keep working until the battery runs out.</p><h4 id="mounting-instructions">Mounting Instructions</h4><p><strong>Seatpost mount:</strong> loop the mounting strap (without LOGO) around one attachment ear, place the mount (silicone pad thinner side up) on the seatpost, then loop the other end (with LOGO) around the other ear and adjust to size. Attach the BC06R to the mount with the switch facing upward. Applicable to seatpost diameters between 25.4mm and 31.6mm.</p><p><strong>Saddle rail mount:</strong> place the mount on the saddle rails, thread a fastening tie through the top hole on each side to secure it to the rails, trim excess, then attach the BC06R with the switch facing upward. Applicable to saddle rail distances between 39.0mm and 50.0mm.</p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed head can cause damage and will void the warranty.</li><li>Recharge the battery promptly to ensure normal use next time, and recharge a stored light every four months.</li><li>Flickering, intermittent shining, or failure to illuminate is usually due to a poor battery level &#x2014; recharge the battery.</li><li>If issues persist, contact your authorized distributor.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC06R bicycle taillight, saddle rail mount, 4 fastening ties, seatpost mount, mounting strap, USB Type-C charging cable, user manual, and warranty card.</p>

Fenix BC06R Reference Manual

There are two reasons that this might happen. First, the light features Intelligent Overheat Protection which may be triggered after a period of use because high-powered LED lights can generate a lot of heat. When the light reaches 140°F (60°C), the

<p>There are two reasons that this might happen. First, the light features Intelligent Overheat Protection which may be triggered after a period of use because high-powered LED lights can generate a lot of heat. When the light reaches 140&#xB0;F (60&#xB0;C), the overheat protection will be triggered and the light will step down to a lower output while it reduces temperature. Once the temperature is below that level you will be able to select the output again. Second, Fenix flashlights feature digital brightness regulation. This means that if the light detects that the battery does not have enough energy to safely support the Turbo brightness level, it will drop to High and you won&apos;t be able to select Turbo again until the battery has been charged. This prevents the light from putting a strain on the battery and it ensures that your light will never flicker or fade out unexpectedly!</p>

Why does the BC21R V3 sometimes downshift to a lower output level?

Yes, the BC21R (V1) bike mount is able to turn left or right.

<p>Yes, the BC21R (V1) bike mount is able to turn left or right.</p>

Does the Fenix BC21R (V1) bike mount allow any left-right adjustment?

The BC21R V3 bike light does not feature a lockout function but you can prevent accidental activation of the light by unscrewing the tail cap a small amount or removing the battery while it is not in use.

<p>The BC21R V3 bike light does not feature a lockout function but you can prevent accidental activation of the light by unscrewing the tail cap a small amount or removing the battery while it is not in use.</p>

How can I prevent accidental activation of the BC21R V3?

Condensed reference manual for the Fenix BC15R lightweight rechargeable bicycle light.

<p>The Fenix BC15R is a lightweight rechargeable bicycle light. This summary is drawn from the manufacturer&apos;s official user manual &#x2014; see the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc15r-lightweight-rechargeable-bicycle-light" class="fr-strong">the product page</a> for complete details.</p><h4 id="warning">Warning</h4><ul><li>Place this light out of the reach of children.</li><li>Do not shine the light directly into the eyes of anyone.</li><li>Do not place the light head near flammable objects &#x2014; high temperatures can cause objects to overheat and become flammable/ignite.</li><li>Do not use the light in inappropriate ways such as holding the unit in your mouth; doing so could cause serious personal injury or death if the light or internal battery fails.</li><li>This light will accumulate a significant amount of heat while operating, resulting in a high temperature of the light shell. Pay close attention to avoid burns.</li><li>Turn off the light to prevent accidental activation during storage or transportation.</li><li>The LED of this light is not replaceable; the whole light will need to be replaced when the LED reaches the end of its lifespan.</li></ul><h4 id="overview">Overview</h4><ul><li>400 lumens maximum output and 78 meters maximum beam distance</li><li>Built-in 2600mAh battery</li><li>USB Type-C charging</li><li>Easy and fast operation with a single switch</li><li>Battery level indication and low-voltage warning</li><li>Anti-glare cut-off facula line makes urban commuting safer for oncoming persons</li><li>Compatible with Fenix bicycle light helmet holder and bicycle light holder with GoPro interface</li><li>IP66 rated protection</li><li>Size: 4.02&apos;&apos; x 1.24&apos;&apos; x 1.22&apos;&apos; / 102 x 31.5 x 31 mm. Weight: 3.84 oz / 109 g (including battery)</li></ul><h4 id="operating-instructions">Operating Instructions</h4><p><strong>On/Off:</strong> press and hold the switch for 0.5 seconds to turn the light on/off.</p><p><strong>Output Selection:</strong> with the light switched on, single click the switch to cycle through Low &#x2192; Med &#x2192; High.</p><p><strong>Flash Mode:</strong> with the light switched on, double click the switch to enter Flash mode; single click again to exit Flash mode and return to the previously used mode.</p><p><strong>Intelligent Memory Circuit:</strong> the light memorizes the last selected output, excluding Flash mode. When turned on again, the previously used mode will be recalled.</p><h4 id="charging">Charging</h4><p>Switch off the light and open the anti-dust cap to reveal the USB Type-C charging port; plug the USB A socket of the charging cable into an electrical outlet, then connect the USB Type-C socket of the charging cable to the light. The indicator displays red while charging and turns green when fully charged &#x2014; be sure to close the anti-dust cap afterward to maintain dust/water resistance. A full charge from depleted takes about 2 hours; recharge a stored light every four months to maintain optimum battery performance. Low mode can be operated while charging, but the charging time will be prolonged.</p><h4 id="battery-level-indication">Battery Level Indication</h4><p>With the light switched off, single click the switch to check the battery status; the indicator shows the status for 3 seconds: green on (saturated, 100&#x2013;85%), green flashing (sufficient, 85&#x2013;50%), red on (poor, 50&#x2013;25%), red flashing (critical, 25&#x2013;1%).</p><h4 id="technical-parameters-ansiplato-fl1">Technical Parameters (ANSI/PLATO FL1)</h4><ul><li><strong>High:</strong> Output 400 lumens, Runtime 3 hours 40 minutes*, Distance 78 meters, Intensity 1504 candela</li><li><strong>Med:</strong> Output 150 lumens, Runtime 10 hours 30 minutes, Distance 47 meters, Intensity 549 candela</li><li><strong>Low:</strong> Output 50 lumens, Runtime 31 hours 30 minutes, Distance 28 meters, Intensity 200 candela</li><li><strong>Flash:</strong> Output 400/50 lumens</li></ul><p>Impact Resistance: 1 meter &#xA0;|&#xA0; Waterproof: IP66</p><p><em>Note: Specs measured by Fenix using the Fenix ARB-L18-2600 battery at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies. *High output is measured in total runtime including output at reduced levels due to the built-in temperature protection mechanism.</em></p><h4 id="intelligent-overheat-protection">Intelligent Overheat Protection</h4><p>The light will accumulate heat when used at relatively high modes for extended periods, and will automatically downshift to a lower brightness level to reduce the temperature to a safe level. High mode can be reselected if needed.</p><h4 id="low-voltage-warning">Low-Voltage Warning</h4><p>When the voltage level drops below the preset level, the bicycle light downshifts to a lower brightness level until Low output is reached. At Low output, the battery level indicator constantly blinks red to remind you to recharge until the battery level runs out.</p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed head can cause damage and will void the warranty.</li><li>Recharge the battery in time to ensure normal use for next time.</li><li>Recharge a stored light every four months to maintain optimum performance of the battery.</li><li>Once charging is completed, be sure to close the anti-dust cover.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC15R bicycle light, USB Type-C charging cable, user manual, information leaflet, and warranty card.</p>

Fenix BC15R Reference Manual

Condensed reference manual for the Fenix BC22R high-performance road bike light.

<p>The Fenix BC22R is a high-performance road bike light. This summary is drawn from the manufacturer&apos;s official user manual &#x2014; see the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc22r-high-performance-road-bike-light">the product page</a> for complete details.</p><h4 id="warning">Warning</h4><ul><li>Do not place this light in the reach of children.</li><li>Do not shine the light directly into the eyes of anyone.</li><li>Do not place the light head near flammable objects &#x2014; high temperatures can cause objects to overheat and become flammable/ignite.</li><li>Do not use the light in inappropriate ways such as holding the unit in your mouth; doing so could cause serious personal injury or death if the light or internal battery fails.</li><li>This light will accumulate a significant amount of heat while operating, resulting in a high temperature of the light shell. Pay close attention to avoid burns.</li><li>Turn off the light to prevent accidental activation during storage or transportation.</li><li>The LED of this light is not replaceable; the light will need to be replaced when the LED reaches the end of its lifespan.</li></ul><h4 id="overview">Overview</h4><ul><li>1400 lumens maximum output and 156 meters maximum beam distance</li><li>Utilizes one Luminus SST40 LED with a lifespan of 50,000 hours</li><li>Includes a replaceable Fenix ARB-L18-3400 battery</li><li>USB Type-C charging</li><li>Marine bionic design, integrated with aerodynamics, to reduce wind resistance while riding</li><li>Supports normal and inverse installations</li><li>Easy and fast operation with a single switch</li><li>Battery level indication and low-voltage warning</li><li>Anti-glare cut-off facula line makes urban commuting safer</li><li>Half-open lens design allows the light beam to illuminate from both sides, warning vehicles coming from the left, right and rear</li><li>Size: 4.53&apos;&apos; x 1.35&apos;&apos; x 1.14&apos;&apos; / 115 x 34.2 x 29 mm. Weight: 5.54 oz / 157 g (including battery)</li></ul><h4 id="operating-instructions">Operating Instructions</h4><p><strong>On/Off:</strong> press and hold the switch for 0.5 seconds to turn the light on/off.</p><p><strong>Output Selection:</strong> with the light switched on, single click the switch to cycle through Low &#x2192; Med &#x2192; High &#x2192; Turbo.</p><p><strong>Flash Mode:</strong> with the light switched on, press and hold the switch for 1.2 seconds to enter Flash; single click again to exit Flash and return to the previously used output.</p><p><strong>Intelligent Memory Circuit:</strong> the light memorizes the last selected output, excluding Flash. When turned on again, the previously used output will be recalled.</p><h4 id="battery-specifications">Battery Specifications</h4><ul><li><strong>Fenix ARB-L18 Series (18650, 3.6V):</strong> Recommended</li><li><strong>Non-rechargeable Lithium (CR123A, 3.0V):</strong> Banned</li><li><strong>Rechargeable Li-ion (18650, 3.6V):</strong> Cautious</li><li><strong>Rechargeable LiFePO4 (16340, 3.2V):</strong> Banned</li><li><strong>Rechargeable LiFePO4 (18650, 3.2V):</strong> Banned</li></ul><p><em>18650 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Only using quality batteries with circuit protection will reduce the potential for combustion or explosion; cell damage or short circuiting are considered user-induced damage and are not covered by any Fenix warranty or liability.</em></p><p><strong>Battery Replacement:</strong> unscrew the light body and insert the battery with the anode side (+) towards the light head, then screw the light head back on.</p><h4 id="charging">Charging</h4><p>Turn off the light, open the anti-dust cover to reveal the USB Type-C charging port, and connect the USB Type-C socket of the charging cable to the light. The indicator will display red while charging and will turn green when fully charged &#x2014; be sure to close the anti-dust cover afterward to maintain dustproof and waterproof ability. The normal charging time is approximately 3 hours from depleted to fully charged; recharge a stored light every four months to maintain optimum battery performance. Low or Med output can be operated while charging, but the charging time will be prolonged.</p><h4 id="battery-level-indication">Battery Level Indication</h4><p>With the light switched off, single click the switch to check the battery status; the indicator will last for 3 seconds: green on (saturated, 100&#x2013;85%), green flashing (sufficient, 85&#x2013;50%), red on (poor, 50&#x2013;25%), red flashing (critical, 25&#x2013;1%).</p><h4 id="technical-parameters-ansiplato-fl1">Technical Parameters (ANSI/PLATO FL1)</h4><ul><li><strong>Turbo:</strong> Output 1400 lumens, Runtime 2 hours 20 minutes*, Distance 156 meters, Intensity 6100 candela</li><li><strong>High:</strong> Output 600 lumens, Runtime 5 hours 30 minutes, Distance 100 meters, Intensity 2450 candela</li><li><strong>Med:</strong> Output 200 lumens, Runtime 11 hours, Distance 57 meters, Intensity 800 candela</li><li><strong>Low:</strong> Output 50 lumens, Runtime 41 hours, Distance 28 meters, Intensity 200 candela</li><li><strong>Flash:</strong> Output 200/50 lumens</li></ul><p>Impact Resistance: 1.5 meters &#xA0;|&#xA0; Waterproof: IP66</p><p><em>Note: Specs measured by Fenix using one Fenix ARB-L18-3400 battery at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies. *Turbo output is measured in total runtime including output at reduced levels due to temperature or the built-in protection mechanism.</em></p><h4 id="intelligent-overheat-protection">Intelligent Overheat Protection</h4><p>The light will accumulate a lot of heat when used at high output levels for extended periods. When the light reaches a temperature of 60&#xB0;C/140&#xB0;F or above, it will automatically step down a few lumens to reduce the temperature; when the temperature drops below 60&#xB0;C/140&#xB0;F, the light automatically recalls the previously used output level.</p><h4 id="low-voltage-warning">Low Voltage Warning</h4><p>When the voltage level drops below the preset level, the light is programmed to downshift to a lower brightness level until Low output is reached. At Low output, the battery level indicator blinks red to remind you to replace or recharge the battery.</p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed head can cause damage and will void the warranty.</li><li>Recharge the battery in time to ensure normal use for next time, and recharge a stored light every four months to maintain optimum performance.</li><li>Fenix recommends using an excellent quality battery.</li><li>If the lamp will not be used for an extended period, remove the battery, or it could be damaged by electrolyte leakage.</li><li>Loosen the light body or take out the battery to prevent accidental activation during storage or transportation.</li><li>Periodic cleaning of the battery contacts improves performance, as dirty contacts may cause flickering, intermittent shining, or failure to illuminate.</li><li>If issues persist, contact your authorized distributor.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC22R bicycle light, ARB-L18-3400 battery, USB Type-C charging cable, spare O-ring, adapter mount, handlebar mount, user manual, and warranty card.</p>

Fenix BC22R Reference Manual

Condensed reference manual for the Fenix BC26R LED bike light.

<p>The Fenix BC26R is an LED bike light. This summary is drawn from the manufacturer&apos;s official user manual &#x2014; see the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc26r-bike-light">the product page</a> for complete details.</p><h4 id="warning">Warning</h4><ul><li>The bicycle light is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the light directly into anyone&apos;s eyes.</li><li>This bicycle light will accumulate a lot of heat when used for extended periods, resulting in a high temperature of the light shell. Pay attention to safe use to avoid scalding.</li><li>Do not shine an object at close range, to avoid burning the object or causing danger due to high temperature.</li><li>The LED of this bicycle light is not replaceable; the entire light should be replaced when the LED reaches the end of its life.</li></ul><h4 id="overview">Overview</h4><ul><li>1600 lumens maximum output and 169 meters maximum beam distance</li><li>Utilizes a Luminus LED with a lifespan of 50,000 hours</li><li>Includes a 5000mAh Li-ion battery and is compatible with an 18650 Li-ion battery (with an ALF-18 battery holder)</li><li>USB Type-C charging</li><li>Quick-release design, two-step assembly and disassembly</li><li>Easy and fast operation with a single switch</li><li>Boot-up battery level indication and low-voltage warning</li><li>Size: 4.45&apos;&apos; x 1.14&apos;&apos; x 1.06&apos;&apos; / 113 x 29 x 27 mm. Weight: 5.47 oz / 155 g (including battery)</li></ul><h4 id="operating-instructions">Operating Instructions</h4><p><strong>On/Off:</strong> press and hold the side switch for 0.5 seconds to turn the light on/off.</p><p><strong>Output Selection:</strong> with the light switched on, single click the switch to cycle through Low &#x2192; Med &#x2192; High &#x2192; Turbo.</p><p><strong>Flash Mode:</strong> with the light switched on, double click the switch to enter Flash mode; single click again to exit Flash mode and return to the previously used mode.</p><p><strong>Intelligent Memory Circuit:</strong> the bicycle light memorizes the last selected output, excluding Flash mode. When turned on again, the previously used mode will be recalled.</p><h4 id="battery-specifications">Battery Specifications</h4><ul><li><strong>Fenix ARB-L21 Series (21700, 3.6V):</strong> Recommended</li><li><strong>Fenix ARB-L18 Series (18650, 3.6V):</strong> Usable (with ALF-18 battery holder)</li><li><strong>Rechargeable Li-ion (16340, 3.6V):</strong> Banned</li><li><strong>Rechargeable Li-ion (18650, 3.6V):</strong> Banned</li><li><strong>Rechargeable LiFePO4 (16340, 3.2V):</strong> Banned</li><li><strong>Rechargeable LiFePO4 (18650, 3.2V):</strong> Banned</li></ul><p><em>21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Only using quality batteries with circuit protection will reduce the potential for combustion or explosion; cell damage or short circuiting are potential risks the user assumes.</em></p><p><strong>Battery Replacement:</strong> unscrew the tail cap and insert the battery following the polarity marks, then screw the cap back on.</p><h4 id="charging">Charging</h4><p>Switch off the light and open the USB cap to reveal the USB Type-C charging port; plug the USB A socket of the charging cable into an electrical outlet, then connect the USB Type-C socket of the charging cable to the light. The indicator will display red while charging and will turn green when fully charged &#x2014; be sure to tighten the light head afterward to maintain dustproof and waterproof ability. The normal charging time of the included ARB-L21-5000 battery is approximately 4 hours from depleted to fully charged; recharge a stored light every four months to maintain optimum battery performance. Low output is available while charging, but the charging time will be prolonged.</p><h4 id="battery-level-indication">Battery Level Indication</h4><p>Each time the light is turned on, the indicator will show the battery level for 3 seconds (works only with the Fenix ARB-L21 series 21700 rechargeable Li-ion battery): green on (saturated, 100&#x2013;85%), green flashing (sufficient, 85&#x2013;50%), red on (poor, 50&#x2013;25%), red flashing (critical, 25&#x2013;1%).</p><h4 id="technical-parameters-ansiplato-fl1">Technical Parameters (ANSI/PLATO FL1)</h4><ul><li><strong>Turbo:</strong> Output 1600 lumens, Runtime 3.5 hours*, Distance 169 meters, Intensity 7158 candela</li><li><strong>High:</strong> Output 600 lumens, Runtime 9.5 hours, Distance 101 meters, Intensity 2560 candela</li><li><strong>Med:</strong> Output 200 lumens, Runtime 18 hours, Distance 57 meters, Intensity 834 candela</li><li><strong>Low:</strong> Output 50 lumens, Runtime 65 hours, Distance 28 meters, Intensity 206 candela</li><li><strong>Flash:</strong> Output 600 lumens</li></ul><p>Impact Resistance: 1.5 meters &#xA0;|&#xA0; Submersible: IP68</p><p><em>Note: Specs measured by Fenix using one Fenix ARB-L21-5000 Li-ion battery at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies. *Turbo output is measured in total runtime including output at reduced levels due to temperature or the built-in protection mechanism.</em></p><h4 id="intelligent-overheat-protection">Intelligent Overheat Protection</h4><p>The light will accumulate a lot of heat when used at relatively high modes for extended periods. When the light reaches a temperature of 60&#xB0;C or above, it will automatically step down a few lumens to reduce the temperature; when the temperature drops below 60&#xB0;C, it will allow the user to reselect the mode.</p><h4 id="low-voltage-warning">Low-Voltage Warning</h4><p>When the voltage level drops below the preset level, the bicycle light is programmed to downshift to a lower brightness level until Low output is reached. At Low output, the battery level indicator constantly blinks red to remind you to recharge or replace the battery (works only with the Fenix ARB-L21 series 21700 rechargeable Li-ion battery).</p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed head can cause damage to the light and will void the warranty.</li><li>Fenix recommends using only a high-quality protected battery.</li><li>If the light will not be used for an extended period, remove the battery for proper storage.</li><li>Unscrew the tail cap or remove the battery to prevent accidental activation during storage or transportation.</li><li>Long-term use can result in O-ring wear &#x2014; to maintain a proper water seal, replace the ring with an approved spare.</li><li>Periodic cleaning of the battery contacts improves the light&apos;s performance, as dirty contacts may cause flickering, intermittent shining, or failure to illuminate.</li><li>If issues persist, contact your authorized distributor.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC26R bicycle light, ARB-L21-5000 Li-ion battery, USB Type-C charging cable, quick-release bike mount, spare O-ring, user manual, and warranty card.</p>

Fenix BC26R Reference Manual

Condensed reference manual for the Fenix BC28R smart head and tail bike light combo.

<p>The Fenix BC28R is a smart head and tail bike light combo. This summary is drawn from the manufacturer&apos;s official user manual &#x2014; see the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc28r-smart-head-tail-bike-light-combo" class="fr-strong">the product page</a> for complete details.</p><h4 id="warning">Warning</h4><ul><li>Do not look directly at the light sources, stare at the beams for a long time, or shine this product directly into the eyes of anyone.</li><li>Do not place this product in the reach of children.</li><li>Do not place light heads near flammable objects &#x2014; high temperatures can cause objects to overheat and become flammable/ignite.</li><li>Do not use this product in inappropriate ways such as holding it in your mouth; doing so could cause serious personal injury or death if the lights or internal batteries fail.</li><li>This product will accumulate a significant amount of heat while operating, resulting in a high temperature of the light shells. Pay close attention to avoid burns.</li><li>Turn off this product or remove the battery to prevent accidental activation when the product is placed in a closed and flammable environment such as pockets and backpacks.</li><li>The LEDs of this product are not replaceable; the whole product will need to be replaced when any LED reaches the end of its lifespan.</li></ul><h4 id="overview">Overview</h4><ul><li>Maximum output 2500 lumens, maximum beam distance 180 meters</li><li>Equipped with high-quality light sources: 1x Cree XHP50D white LED, 1x red COB</li><li>Smart linked-control solution for front and tail lights, efficient and convenient to operate</li><li>Front light displays the tail light mode status in real time, making riding safety indications clear at a glance</li><li>Uses an anti-glare cut-off facula line design to effectively reduce glare, meeting the needs of safe and courteous riding</li><li>Front light is powered by one replaceable ARB-L21-5000 V2.0 battery; tail light features a built-in 400mAh battery</li><li>USB Type-C standard charging port</li><li>Battery level indication and low-voltage warning</li><li>IP66-rated protection and 1.5 meters impact resistance</li><li>Size: front light 4.33&apos;&apos; x 1.14&apos;&apos; x 1.57&apos;&apos; / 110 x 29 x 40 mm, tail light 1.38&apos;&apos; x 1.42&apos;&apos; x 1.30&apos;&apos; / 35 x 36 x 33 mm (excluding mounts). Weight: front light 8.47 oz / 240 g, tail light 1.98 oz / 56 g (including mount, battery, and accessories)</li></ul><h4 id="operating-instructions">Operating Instructions</h4><p><strong>Front and Tail Light Pairing:</strong> by default, press and hold the tail light switch for about 5 seconds; the tail light indicator will flash red and green alternately, indicating it has entered pairing mode. Single click the front light switch &#x2014; the tail light indicator will turn steady green. Single click the tail light switch again to confirm, and pairing is complete. Once paired, the front light automatically remembers the tail light; the straight-line pairing distance should not exceed 1.5 meters, and pairing mode times out after 60 seconds of no operation.</p><p><strong>Front Light On/Off:</strong> press and hold the front light switch for 0.5 seconds to turn it on/off.</p><p><strong>Front Light Output Selection:</strong> with the front light on, single click the switch to cycle through Low &#x2192; Med &#x2192; High &#x2192; Turbo.</p><p><strong>Front Light Flash Mode:</strong> double click the switch to enter Flash mode; single click again to return to the previously used General mode output. Flash mode does not work when the front light battery is below 10%.</p><p><strong>Tail Light On/Off:</strong> press and hold the tail light switch for 0.5 seconds to turn it on/off.</p><p><strong>Tail Light Output Selection:</strong> with the tail light on, single click the tail light switch (or the front light switch) to cycle through Low &#x2192; Low Slow-flash &#x2192; Low Fast-flash &#x2192; High &#x2192; High Slow-flash. The front light switch indicator simultaneously displays the tail light&apos;s current output status.</p><p><strong>Standby Mode:</strong> with the tail light on, press and hold the front light switch for more than 0.5 seconds to enter standby. Press either switch to wake the tail light and recall the previously used output; with no operation within 1 hour, the tail light automatically turns off.</p><p><strong>Intelligent Memory Circuit:</strong> both lights memorize the last selected output, excluding Turbo and Flash. When turned on again, the previously used output will be recalled.</p><h4 id="battery-specifications-front-light">Battery Specifications (Front Light)</h4><ul><li><strong>Fenix ARB-L21-5000 V2.0 (21700, 3.6V):</strong> Recommended</li><li><strong>Fenix ARB-L21 Series (21700, 3.6V):</strong> Usable</li><li><strong>Fenix ARB-L18 Series (18650, 3.6V):</strong> Banned</li><li><strong>Rechargeable Battery (21700, 3.7V):</strong> Banned</li></ul><p><em>21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using low-quality batteries or mishandling batteries (such as short-circuiting or overheating) could lead to combustion and jeopardize the safety of users and property. Using quality batteries with circuit protection will reduce the potential for combustion or explosion. The tail light battery is non-replaceable.</em></p><p><strong>Battery Replacement (Front Light):</strong> insert the included battery compartment key into the slot on the front light&apos;s tail battery compartment cover, and turn it counterclockwise to open the cover. Insert the battery with the anode side facing inward, then tighten the cover clockwise. Do not use a sharp tool to pry open the compartment.</p><h4 id="charging">Charging</h4><p>Open the anti-dust cover, and connect the Type-C end of the charging cable to the charging port of the front or tail light. The indicator displays a steady red light while charging and turns steady green when fully charged. All outputs can be used normally while charging. When powered off, the normal charging time is about 3.5 hours for the front light and about 1.5 hours for the tail light. Maximum charging power: front light 15W (5V/3A), tail light 2.5W (5V/0.5A) &#x2014; use only a certified USB charging adapter that complies with local safety standards. Be sure to close the anti-dust cover firmly once charging is complete.</p><h4 id="battery-level-indication">Battery Level Indication</h4><p>Each time the product is turned on, the indicator will show the battery level for 3 seconds (works only with a Fenix ARB-L21 series rechargeable battery, and only applies to the front light): green on (saturated, 100&#x2013;85%), green flashing (sufficient, 85&#x2013;50%), red on (poor, 50&#x2013;25%), red flashing (critical, 25&#x2013;1%).</p><h4 id="technical-parameters-ansiplato-fl1">Technical Parameters (ANSI/PLATO FL1)</h4><p><strong>Front Light &#x2014; General and Flash Modes:</strong></p><ul><li><strong>Turbo:</strong> Output 2500 lumens, Runtime 2 hours 36 minutes*, Distance 180 meters, Intensity 8083 candela</li><li><strong>High:</strong> Output 1400 lumens, Runtime 7 hours, Distance 127 meters, Intensity 4017 candela</li><li><strong>Med:</strong> Output 600 lumens, Runtime 12 hours, Distance 82 meters, Intensity 1675 candela</li><li><strong>Low:</strong> Output 50 lumens, Runtime 52 hours, Distance 23 meters, Intensity 137 candela</li><li><strong>Flash:</strong> Output 600/50 lumens</li></ul><p><strong>Tail Light &#x2014; Warning Modes (100 meter warning distance for all):</strong></p><ul><li><strong>Low:</strong> Output 10 lumens, Runtime 6 hours</li><li><strong>Low Slow-flash:</strong> Output 10 lumens, Runtime 10 hours</li><li><strong>Low Fast-flash:</strong> Output 10 lumens, Runtime 15 hours</li><li><strong>High:</strong> Output 20 lumens, Runtime 3 hours 43 minutes</li><li><strong>High Slow-flash:</strong> Output 20 lumens, Runtime 6 hours 38 minutes</li></ul><p>Impact Resistance: 1.5 meters &#xA0;|&#xA0; Waterproof: IP66</p><p><em>Note: Specs measured by Fenix using one Fenix ARB-L21-5000 V2.0 battery (front light) / one built-in 400mAh battery (tail light) at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies. *Turbo output is measured in total runtime including output at reduced levels due to temperature or the built-in protection mechanism.</em></p><h4 id="intelligent-overheat-protection">Intelligent Overheat Protection</h4><p>The product will accumulate a lot of heat when used at high output levels for extended periods. When it reaches a temperature of 50&#xB0;C/122&#xB0;F or above, it will automatically step down a few lumens to reduce the temperature; when the temperature drops below 50&#xB0;C/122&#xB0;F, the product will gradually recall the preset output level.</p><h4 id="low-voltage-warning">Low-Voltage Warning</h4><p>When the battery level is low, the battery level indicator will blink red at 3 Hz to remind users to recharge in a timely manner. The product will not turn off automatically, and the indicator will keep blinking until the battery runs out.</p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed heads can cause damage to the product and will void the warranty.</li><li>Fenix recommends using an excellent quality battery.</li><li>If the front light will not be used for an extended period, remove the battery, or it could be damaged by electrolyte leakage.</li><li>Recharge a stored product every three months to maintain optimum performance of the batteries.</li><li>Periodic cleaning of the product and battery contacts improves performance, as dirty contacts may cause flickering, intermittent shining, or failure to illuminate.</li><li>If issues persist, contact the distributor.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC28R front light, BC28R tail light, front light bicycle mount, seatpost mount, mounting strap, ARB-L21-5000 V2.0 battery, battery compartment key, USB Type-C charging cable, spare O-ring, spare bicycle mounting shim, user manual, and warranty card.</p>

Fenix BC28R Reference Manual

Condensed reference manual for the Fenix BC45R dual-distance mountain bike light with remote switch.

<p>The Fenix BC45R is a dual-distance mountain bike light with a wireless remote switch. This summary is drawn from the manufacturer&apos;s official user manual &#x2014; see the downloadable PDF reference manual on <a href="https://www.fenix-store.com/products/fenix-bc45r-dual-distance-mountain-bike-light-with-remote-switch" class="fr-strong">the product page</a> for complete details.</p><h4 id="warning">Warning</h4><ul><li>Do not place this bicycle light in the reach of children.</li><li>Do not shine this bicycle light directly into the eyes of anyone.</li><li>Do not place the light head near flammable objects &#x2014; high temperatures can cause objects to overheat and become flammable/ignite.</li><li>Do not use this bicycle light in inappropriate ways such as holding the unit in your mouth; doing so could cause serious personal injury or death if the light or internal batteries fail.</li><li>This bicycle light will accumulate a significant amount of heat while operating, resulting in a high temperature of the light shell. Pay close attention to avoid burns.</li><li>Turn off and lock the bicycle light, or remove the batteries, to prevent accidental activation when the light is placed in a closed and flammable environment such as pockets and backpacks.</li><li>The light sources of this bicycle light are not replaceable; the whole light will need to be replaced when any light source reaches the end of its lifespan.</li></ul><h4 id="overview">Overview</h4><ul><li>3300 lumens maximum output, 286 meters maximum beam distance</li><li>Utilizes one SFT-40 cold white LED and four SST12 cold white LEDs, each with a lifespan of 50,000 hours</li><li>Powered by two included 18650-3400mAh batteries; batteries can be replaced</li><li>High beam and low beam can be controlled independently or in combination via switches on the wireless remote and bicycle light</li><li>OLED display clearly indicates the battery level, charging status, brightness level, mode, and other information</li><li>Inner waterproof USB Type-C charging port</li><li>IP66-rated protection and 1.5 meters impact resistance</li><li>Made of durable A6061-T6 aluminum alloy</li><li>Quick-release mount, easy to assemble and disassemble</li><li>Size: 4.92&apos;&apos; x 1.97&apos;&apos; x 1.46&apos;&apos; / 125 x 45 x 37 mm. Weight: 10.58 oz / 300 g (including batteries)</li></ul><h4 id="operating-instructions--bicycle-light">Operating Instructions &#x2014; Bicycle Light</h4><p>The bicycle light has two switches: the high beam switch controls High beam mode, and the low beam switch controls Low beam mode.</p><p><strong>On/Off:</strong> press and hold the high beam switch for over 0.5 seconds to turn High beam mode on/off; press and hold the low beam switch for over 0.5 seconds to turn Low beam mode on/off.</p><p><strong>Output Selection:</strong> in High beam mode, single click the high beam switch to cycle through Low &#x2192; Med &#x2192; High; in Low beam mode, single click the low beam switch to cycle through Eco &#x2192; Low &#x2192; Med &#x2192; High.</p><p><strong>Lockout Function:</strong> with the light off and unlocked, double click either switch within 0.5 seconds to lock (the light blinks twice in Eco output of Low beam mode). With the light locked, double click either switch within 0.5 seconds to unlock (the light enters the selected mode at its lowest output level).</p><h4 id="operating-instructions--wireless-remote">Operating Instructions &#x2014; Wireless Remote</h4><p>The remote has three switches: the high beam switch controls High beam mode, the low beam switch controls Low beam mode, and the functional switch controls Special mode.</p><p><strong>Connecting with BC45R:</strong> press and hold either switch on the bicycle light for 5 seconds until the OLED display shows &quot;Connecting&quot;; single click any switch on the remote until it shows &quot;Pair?&quot;; single click either switch on the bicycle light until it shows &quot;Connected!&quot; to complete pairing. Once paired, the remote automatically remembers the paired status &#x2014; no re-pairing is required. The initial pairing must be completed within 60 seconds or it cancels automatically.</p><p><strong>Output Selection:</strong> with the light on, single click the high beam switch to cycle through Low &#x2192; Med &#x2192; High; single click the low beam switch to cycle through Eco &#x2192; Low &#x2192; Med &#x2192; High; single click the functional switch to enter Turbo, or double click it to enter Flash (single click any other switch to exit Flash and return to the previous output). If the battery is low while Turbo is on, it lights up at the highest brightness the current battery level supports.</p><p><strong>Sleep Mode:</strong> with the light on, press and hold the functional switch for over 1.5 seconds to enter Sleep mode (the light goes out and shows a sleep icon on the OLED display). Single click any switch to wake it. Turn off the bicycle light with either switch to exit Sleep mode manually, or it exits automatically after two hours of no operation.</p><p><strong>OLED Display:</strong> remains constantly on to show brightness level, mode, and battery level. If only one battery is inserted, a single-battery icon is shown. Below 10% battery, the icon blinks and High beam brightness is limited to 200 lumens while Low beam is limited to 50 lumens.</p><p><strong>Intelligent Memory Circuit:</strong> the bicycle light automatically memorizes the previously used output, excluding Flash and Turbo. When turned on again, the previously selected output will be recalled.</p><h4 id="battery-specifications">Battery Specifications</h4><ul><li><strong>Fenix ARB-L18 Series (18650, 3.6V):</strong> Recommended</li><li><strong>Rechargeable Battery, Li-ion (18650, 3.6V/3.7V):</strong> Caution</li><li><strong>Rechargeable Battery, LiFePO4 (18650, 3.2V):</strong> Banned</li></ul><p><em>Do not mix batteries of different types or ages, as doing so may cause damage to the bicycle light or the batteries being used. 18650 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using low-quality batteries or mishandling batteries (such as short-circuiting or overheating) could lead to combustion and jeopardize the safety of users and property. Using quality batteries with circuit protection will reduce the potential for combustion or explosion.</em></p><p><strong>Battery Replacement (Bicycle Light):</strong> rotate the tail cap button according to the &quot;OPEN&quot; logo, and pull out the battery case. Insert the batteries according to the polarity marks, then insert the case back into the light body and rotate the tail cap button in the opposite direction of &quot;OPEN&quot; once flush.</p><p><strong>Battery Replacement (Wireless Remote):</strong> insert a coin into the back of the remote, rotate counterclockwise to open the battery cover, insert the battery, and tighten the cover clockwise. Replace the CR1632 button battery every 3 months.</p><h4 id="charging">Charging</h4><p>Turn off the bicycle light and open the anti-dust cover, then plug the USB Type-C end of the charging cable into the charging port. The OLED display shows a charging icon while charging and a complete icon once finished. The Eco/Low/Med outputs of Low beam mode and Low/Med outputs of High beam mode can be used while charging, but this prolongs the charging time. With the light off, the normal charging time of the included ARB-L18-3400 batteries is about 3.5 hours from depleted to fully charged with a 9V/2A adapter; recharge a stored light every four months. The wireless remote cannot be operated while charging. Power specifications: charging voltage 9V, charging power 18W (9V/2A); this light supports fast charging. Use only a certified USB charging adapter that complies with local safety standards.</p><h4 id="mounting-instructions">Mounting Instructions</h4><p>Loosen the screw of the bicycle mount, fix it in the desired position on the handlebar, and fasten the screw. Hold the light and slide it into the mount until a distinct click is heard. Fasten the strap of the wireless remote to the desired position on the handlebar. Adjust the light&apos;s direction before testing power and functions. Use the shims provided according to handlebar diameter: thick only for 22-28mm, thin only for 28-32mm, no shim required for 32-35mm.</p><h4 id="technical-parameters-ansiplato-fl1">Technical Parameters (ANSI/PLATO FL1)</h4><p><strong>High Beam Mode:</strong></p><ul><li><strong>High:</strong> Output 2000 lumens, Runtime 5 hours 15 minutes, Distance 269 meters, Intensity 18211 candela</li><li><strong>Med:</strong> Output 800 lumens, Runtime 6 hours 15 minutes, Distance 174 meters, Intensity 7651 candela</li><li><strong>Low:</strong> Output 200 lumens, Runtime 16 hours 45 minutes, Distance 85 meters, Intensity 1820 candela</li></ul><p><strong>Low Beam Mode:</strong></p><ul><li><strong>High:</strong> Output 1500 lumens, Runtime 5 hours 30 minutes, Distance 142 meters, Intensity 5049 candela</li><li><strong>Med:</strong> Output 800 lumens, Runtime 6 hours 15 minutes, Distance 102 meters, Intensity 2617 candela</li><li><strong>Low:</strong> Output 200 lumens, Runtime 20 hours 15 minutes, Distance 50 meters, Intensity 629 candela</li></ul><p><strong>Special Mode:</strong></p><ul><li><strong>Eco:</strong> Output 50 lumens, Runtime 59 hours 9 minutes, Distance 25 meters, Intensity 157 candela</li><li><strong>Turbo:</strong> Output 3300 lumens*, Runtime 3 hours, Distance 286 meters, Intensity 20486 candela</li><li><strong>Flash:</strong> Output 800-100 lumens</li></ul><p>Impact Resistance: 1.5 meters &#xA0;|&#xA0; Waterproof: IP66</p><p><em>Note: Specs measured by Fenix using two Fenix ARB-L18-3400 batteries at 21&#xB1;3&#xB0;C / 50&#x2013;80% humidity; real-world performance varies. *Turbo output is measured in total runtime including output at reduced levels due to temperature or the built-in protection mechanism.</em></p><h4 id="intelligent-overheat-protection">Intelligent Overheat Protection</h4><p>The bicycle light will accumulate a lot of heat when used at high output levels for extended periods. When it reaches a temperature of 55&#xB0;C/131&#xB0;F or above, it will automatically step down a few lumens to reduce the temperature; when the temperature drops below 50&#xB0;C/122&#xB0;F, it will gradually recall the preset output level.</p><h4 id="low-voltage-warning">Low-Voltage Warning</h4><p>When the voltage level drops below the preset level, the bicycle light downshifts to a lower brightness level until Eco output is reached. At Eco output, the battery icon on the OLED display blinks to remind users to replace or recharge the batteries; the light will not turn off automatically, and the icon keeps blinking until the battery runs out. This only works with a Fenix ARB-L18 Series battery.</p><h4 id="usage-and-maintenance">Usage and Maintenance</h4><ul><li>Disassembling the sealed head can cause damage to the bicycle light and will void the warranty.</li><li>Replace or recharge the batteries in time to ensure normal use for next time.</li><li>Fenix recommends using excellent quality batteries.</li><li>If the bicycle light will not be used for an extended period, remove the batteries, or it could be damaged by electrolyte leakage.</li><li>Recharge a stored bicycle light every three months to maintain optimum performance of the batteries.</li><li>Long-term use can result in O-ring wear &#x2014; to maintain a proper water seal, replace the ring with an approved spare.</li><li>Periodic cleaning of the bicycle light and battery contacts improves performance, as dirty contacts may cause flickering, intermittent shining, or failure to illuminate.</li><li>If issues persist, contact the distributor.</li></ul><h4 id="whats-included">What&apos;s Included</h4><p>Fenix BC45R bicycle light, bicycle mount, bicycle mounting shim (thin/thick), wireless remote, CR1632 battery, 2x ARB-L18-3400 batteries, USB Type-C charging cable, spare O-ring, user manual, and warranty card.</p>

Fenix BC45R Reference Manual

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