I've been using this external battery to charge my ipod touch for 2 years, and I've found it to be indispensable. I can get numerous charges out of one fully recharged battery pack, and it's so compact that I can pop it in my purse so that I'm never without power for my device. It charges the device quickly, too -- possibly even faster than charging the device in a wall outlet (though I've never actually tested that theory).