... delivery USB 2.0 Power bank for iphone 4/4S and ipad portable and high quality 4000mAh capacity 100% brand ... current:800mACapacity:4000mAhLamp:4 LED LampOutput USB:5V--1.5AWorking temperature:-10 °C--40 °CStorage temoerature: ... of device,please make sure do followings:1,pls charge device every three months,when ... .How to charge?Charging method 1:Charging power by USB2.0 cable through computer USB port. ...