How big are the Fenix 18650 batteries?

The dimensions of the standard ARB-L18 series 18650 batteries (ARB-L18-2600, ARB-L18-2900, and ARB-L18-3500) are 18.6mm x 69mm (.7" x 2.7")

The dimensions of the USB rechargeable ARB-L18 "U" series 18650 batteries (ARB-L18-2600U and ARB-L18-2900U) are 18.6mm x 70mm (.7" x 2.8")

The dimensions of the Cold Resistant ARB-L18-2900L 18650 battery is 18.3mm x 68.8mm (.72" x 2.7")

Learn more about 18650 batteries

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