i.Sound Portable Power Max ($129.99)

The iPad 2 may boast a battery life of over 10 hours, but you never know when you'll be stuck without any juice—especially for if you're a world-traveling mobile gamer (they exist, we're almost sure of it). Try this 16,000 mAh ultraportable backup battery. That big number means you can keep on Sword & Sworceryin' for up to 480 hours without being interrupted by that annoying Apple logo that taunts you for not plugging in. The device is small enough to fit in your pocket, and makes for a must-have if you’re constantly in and out of town and need something to keep your iPad and other devices whirring via its five USB slots.