AA batteries with built-in USB charging-plugs

USBCells are standard-sized AA batteries whose heads flip open to reveal a USB plug; plug them into your PC and they'll recharge off the USB port. I already use USB chargers for my phone and music player and GPS when I'm on the road -- this completes the picture. I wish that every rechargeable device came with a USB recharge point! Link (Thanks, Jason!)

Update: Charlie sez, "Like many NiMH rechargeables in the AA and AAA form factors these are 1.2 VDC and not 1.5 volts like 'real' batteries. This is usually not a problem when a device only uses one or two batteries, but anything that uses four or more in series is unlikely to work properly due to the cumulative difference in voltage. My son's giant robot battle scorpion, for example, requires six batteries in series for 9 volts total, but rechargeables typically only provide 7.2 even at peak charge, and this leaves the scorpion unable to fend off enemy robot cockroaches or the neighbor girl's robot kissing bug."