2600mah Portable External Power Bank Battery Charger for Iphone 4 4s 5 Samsung I9300 I9501 Mega HTC (Gray) the bank power charger is 2600mah, the capacityn of different cellphone has different result of charging. when you first get it, please use out all of the power and then charge it at least 8 hrs at the first time Note: the charger is just for emergency, not for long term using