New Trent Easypak 7000mAh Portable Triple USB Port External Battery Charger/Power Pack for Smartphones, Tablets and more (w/built-in USB cable)
I have a Smasung Galaxy Nexus, which tends to use a major amount of battery power when it's used a lot and not on a Wi-fi connection. A recent doctor's visit left me with about 22% remaining power. I used the NT70T and was quickly back up to speed with plenty of juice left for the rest of the day. Very pleased with the ability to keep going much, much longer and, with the built-in cable, not have to carry cumbersome extras around with me.