Here’s a more environmentally friendly version of the Cellboost disposable battery pack for mobiles. The Mobile Saver from STC Global is a rechargeable power source that you can carrry with you as a back up should your mobile battery run down. The Mobile Saver MSC-1000 can apparently recharge a mobile 3-4 times before it needs recharging itself. Eight LED lights give you a more accurate idea of how much power is left. The power pack itself takes 6-7 hours to recharge (although it’s safe to leave overnight with no risk of overcharging, we’re told). It’s obviously not as fast at recharging your mobile as the usual wall socket, but at 2-3 hours for a full charge, it’s a good solution for those times when you’re away from a power source. There’s also the Mobile Saver MSD-2000 for digital cameras. Prices aren’t cheap, however, starting at $59.99.