New Trent Easypak 7000mAh Portable Triple USB Port External Battery Charger/Power Pack for Smartphones, Tablets and more (w/built-in USB cable)
This battery can charge most Apple products.  I used it on my IPad2.  I did have a little difficulty figuring out how to connect it to my IPad.  I assumed the cable that came with the battery was the one to connect to the IPad.  I was wrong.  You actually use the IPad's own charging cable to connect to the New Trent battery.  The cable that came with the battery is for charging the battery itself.  The battery surprised my in a good way.  I expected to get approximately 50% more power for my IPad.  I actual