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 Galaxy S2 and use it very heavily.  The battery life is terrible on my phone and I was looking for something to charge it when I was out.  I came across the New Trent Easypak and my problems were solved.  Not only does it charge my phone, but it does it faster than the car charger.  My favorite feature are the on board cables so I don't have to lug any around!  I can get a minimum of 4 full charges before the New Trent battery pack needs to be charged again.  It can charge my Android, Kindle and my