Not sure I'm posting in the right forum but I just have to share this. Now that's smart. ^_^
Link
Only available in the UK for now.
Link
Introducing our revolutionary new rechargeable battery - the USBCELL.
This NiMH AA cell can be used like a normal battery and can be recharged simply by plugging into a USB port. No need for a separate charger or cables when travelling. Built in intelligent USB charger. Charging for just a few minutes provides extra hours of instant use for most input devices.
Only available in the UK for now.