6 rechargeable AA USB batteries for £25.97 inc Google checkout. These work out more expensive than wall rechargeables but if you have a laptop with you then you can recharge on the move which may be handy. Apparently cheapest on the netaccording to ebuyer before Google discount so should be competitive.
The USB port is becoming more and more useful. First came the memory card with the built-in USB plug, now comes the USB-charged battery! Moixa Energy have developed the USB Cell as an environmentally-friendly alternative to normal AA batteries. The top of one side flips up to reveal a USB connector, and the battery simply plugs into an open port.
The convenience of the USB Cell means that you don't have to carry around a separate charger or cables, and can charge it in a game station, as well as in keyboards and monitors with USB sockets.
It takes five hours to charge one of the cells if it was fully discharged.
Because the batteries are fully rechargeable, you never need to throw them away, think of all the money you will save compared to when you buy countless amounts of regular batteries!
* No need for extra cables or chargers
* Charges from any USB port
* Has a capacity of 1300mAH
* Works with PC and MAC