Sony CP-A2LS USB Portable Charger with 4,000 mAh Li-Ion Battery 3 easy steps for portable power; 1) Charge modular in AC wall outlet 2) Detach power output modular 3) Charge on the go Pocket Energy for Smartphones Xperia, iPhone, Blackberry & more 4000 mAh Micro USB cable included Battery Charging (approx): 6 hours