A Nickel Metal Hyrdride (NiMH) AA cell used like a normal battery charged via a USB port on your computer or laptop. Very intriguing concept as both the battery and it's charger are contained in one unit. Available as a two-pack, these batteries charge to 90% in 5 hours plugged into a powered USB port and deliver 1300mah of juice, or, alternatively, you can simply charge for a few minutes to get hours of use.
Added from www.usbcell.com