... function: low-voltage protection and high efficiency DC-DC, circuit will cut down power automatic when voltage of battery is low enough ... x CR123 Li-Battery.9: Battery Charge: take out of battery and then charge.10: Switch: click-type tailcap switch11: ... , traffic, fire-fight, water project, forestry, outdoor, explore, trip and so on. Supply High Power Rechargeable Portable LED Flashlight 2000Lm 30W