New Trent Easypak 7000mAh Portable Triple USB Port External Battery Charger/Power Pack for Smartphones, Tablets and more (w/built-in USB cable)
I've used the New Trent IMP70d more often than initially expected, and it has performed well.  It is a standard take-along in my day bag.  A full charge can recharge my empty iPhone4 about 4 times.<br /><br />Normally, my iPhone4 makes it through the day when I have fewer than 2-3 hours talk time.  On longer days, I find it easy to \\"top up\\" mid-way through a day when I've used more juice than usual or if I'll be out late.  It gives peace-of-mind, and there have been occasions where the NewTrent saved th