MiPow SP5500-BK PowerTube mobile Replacement Battery (5500mAh) for smartphones, MP3 players, tablets, Apple devices, ... black (Accessories)
Four stars only because, as I do not like non-standard cable for charging. That should not be necessary today, with mini and micro USB cable, it has enough variety. Otherwise, the battery is simply good. The gimmick with the flashlight like my wife,