New Trent Easypak 7000mAh Portable Triple USB Port External Battery Charger/Power Pack for Smartphones, Tablets and more (w/built-in USB cable)
I purchased the Imax Power IMP500 after researching several external power packs.<br />I needed portable power with a large enough reserve to charge my iPhone 3Gs without  plugging into an AC outlet. This IMP500 is a monster. I took it with me to a convention<br />in Boston. I was able to charge my iPhone several times myself and loaned it to friend<br />and they recharged there iPhone and there was still 3 bars on the power meter. I used it<br />the whole week and never had to recharge the Power Pack. It's