CISNO 3.7V 2600mAh 18650 Li-ion Rechargeable Battery and Charger Tactical Flashlight Outdoor LED Flashlight Torch 3.7v 2600mAh High energy density & Pollution-free.Works with CISNO tactical flashlight. Perfect for LED Flashlight, Headlamp, Digital Camera etc. 18650 size Full Charge Voltage: 4.20V0.05V Cycle life: 500+ times