The USBCELL AA Rechargable Battery - 2 Cell Pack AA Rechargeable Batteries is a revolutionary way to recharge and use batteries! On the outside, it looks like an ordinary AA Rechargeable Battery, but open it to recharge on any USB port. This NiMH AA cell can be used in normal battery applications and can be recharged simply by plugging into a USB port. Our revolutionary NiMH rechargeable battery saves you money and battery waste and is easy to recharge.