... lithium battery,a power management and battery protection cirecuit,and can usedwith computers,cell phones,MP3,MP4,and other players ... with the charger which has a USB interface Method two: Put the USB charging line into the USB interface of computer to charging 2) ... lithium battery,a power management and battery protection cirecuit,and can usedwith computers,cell phones,MP3,MP4,and other players ...