Sanyo UR18500FK 1620mAh cylindrical lithium-ion cell, flashlight battery, camera battery Voltage:3.7V Capacity:1700mAh Charging current:1.13A Dimension:18.3*49.4mm Type:Li-ion Weight:34.5g Rechargeable:Yes Fit for:Flashlights, mobile power, customized battery packs, laptop batteries and camera batteries etc OEM is welcome