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The battery capacity could depend on your body heat as well as the outside temperature
for example
ranging from a battery-saving 5 lumen to a powerful 350 lumen
Lightweight
Free Headlamp Battery M (36Wh) Dry Bags TPU The battery capacity could dependFree Headlamp Battery 36 Wh (M) is a powerful long distance battery. It is rechargeable via USB C and can be attached to a bike frame, helmet or your Free headband. This battery fits all headlamps in the Free Series. The battery meets IPX5 standard (water resistant) and withstands heavy rain and water from any direction. The LED battery indicator will show battery status when charging or when turning on the headlamp, and ensures that you can keep
