USBCell Batteries (recharged via USB port) is £11.90 delivered from Firebox.com
Use £5 voucher, available for everyone to get this price. Only AA batteries are available (obvious).
Description : As the name suggests, these revolutionary AA size batteries are recharged via your computer's USB port - no bulky chargers or cumbersome cables required. Simply flip open the cap at the positive end of the battery to reveal the connector and plug it straight in. Each battery even features an LED that indicates charge status. Genius!
Brilliant for powering PC peripherals such as wireless mice and keyboards, these eco-friendly batteries are also ideal travelling companions when you're out gallivanting with your laptop, as you won't need to sully the line of your suit with additional adaptors and chargers.