We all know how useful rechargeable batteries can be, and the USBCell batteries from Think Geek make powering up easier than ever.
“Now, when your batteries are flatlining, pop the cap, and jam ’em into your nearest ubiquitous USB port. Whether it’s on your computer, laptop, monitor or powered USB hub, all you need is 250mA of juice from your universal serial bus, and a little patience. In just a few hours, you’ll have 1300mAH of power!”
The USBCell Rechargeable batteries retail for $19.95 (set of 2)