What does the mAh mean in lithium-ion batteries?Updated 12 days ago
mAh (milliamp-hour) measures how much charge a battery holds, so a higher number generally means a longer runtime in the same light. For example, a 3,500 mAh 18650 can give up to about 35% more runtime than a 2,600 mAh one, though the real gain depends on your light and the mode you use. Always use the battery size your light lists, because extra capacity only helps if the battery fits (a 26650 won't fit in a light made for 21700 batteries).