... you are charging and discharging.Specification:1, Polymer Lithium-ion battery: 2800mAh/3.7V , high energy and safe. ... female connector, so you only need one cable for charging and discharging, easy to take.4,The ... under the sunshine.9, 2800mAh Capacity buildin battery can charge two times of your mobilephone.10 ... opptional) Compare universal portable mobile power pack for mobile devices, iphone 4,ipad