Plug in a USB-rechargeable battery

British USBCELL company recently launched this AA nickel-metal hydride rechargeable battery, his appearance is the same as the general AA battery, the only difference is that the battery positive cover can be opened, and there is a USB plug. When the power runs out, users simply remove the cover and plug the USB plug into a USB slot on an appliance such as a computer or XBOX360. This not only eliminates the trouble of carrying a charger, but also saves the cost of buying a charger.