... 4400mah 3.7v miner light li-ion battery 1,3.7V/4400mAH 2,Over 500 cycle life 3,High capacity 4,No pollution 4400mah 3.7v miner light li-ion battery ... higher energy density than any rechargeable battery3, Installed IC chip will prevent the battery pack from over charge and ... is available (we could design and develop Li-ion battery according to your product work performance & structure apprearance)