1.Slim design 2.5V lithium polymer battery 3.Low cost high performance 4.5600mah battery charger controller Thank you ... battery charger through USB 2.0 port when you use pc to charge battery charger)2. When charging,LED 1,2,3,4 circularly ... piece of phones connector,one USB cable.Caution:1. When charging,please use original charger,otherwise,battery charger may be damaged.2 ...