... 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 ... charge and over discharge.It helps protect battery chemistry integrity and prolongs battery life.4, Installed polyswitch will cut ... is available (we could design and develop Li-ion battery according to your product work performance & structure apprearance)