... Treatment by paint rubber, Cell Type is lithium battery,Capacity is 1900mAh.feature:1.Power Switch:ON/OFF ... .built-in lithium battery.2.It also can be protector of iphone4.3.Leds on back ... on Charge:First of all,pls turn on the switch,When lithium battery is full of power,pls insert ... ,it might accelerate aging of the device,thereby reducing charging efficienecy and life of battery.do not put it in ...