Xtar 26650 A 3.6V 3.7V LED Flashlight 5200mAh Rechargeable Battery This battery is designed to be used with the Fusion 1000 Lumen FUS1000 Fusion 1500 Lumen FUS1500 Mera Camera Light MERA1080 USB 3500 lumen Spot T3500S and Tovatec 3600 Lumen TOV3600 lights Designed for use in high powered flashlights and headlamps this Xtar 26650 3.6V 3.7V Lithium Ion Rechargeable battery boasts a high capacity of 5200mAh giving it the long life that these power hungry portable devices require Built to last this Xtar cell has a recharge life cycle of 700 charges at 0.25A while an overcharge and discharge circuit is built into the cell to protect it during the cycle This cell is a protected cell and has a protruding button top terminal It is around 2.5mm longer than an unprotected cell Please check if your device requires a protected or unprotected cell before purchasing Volts 3.6/3.7 volts Milliamp Hours 5200 mAh Safety Control circuit Yes Dimensions 26.5mm diameter 68.2mm length Rechargeable Yes Batter