... CE,ROHS,UL 5.For led lights,ups backup battery,power tools ItemContentCapacityNominal Capacity: 4000 mAh Typical Capacity: 3950 mAh ... , Alarm, metering, power backup etcBuilding portable power device that needs high energy density and low weight LiMnNi Rechargeable 3.7V 4000 mAh ... 26650 Cell Use For Power ...