I bought this one a while back and I love it! My only two complaints are I wish they used a switch instead of a power button, it presses in my pocket sometimes. And I wish the cord to charge it was micro USB instead of old school mini USB. Then I could use the same charger cable to charge it and my phone. Luckily I still have plenty of old mini USB cords. I use this all the time when I travel, or go to events that I know will strain my battery. Charge right in my pocket. I've even shared with people at the airport with the second port when they couldn't find a free outlet. The second USB port was a big plus for me so I could charge my phone and my gf's when we travel. Highly recommend these just find the best one for you. Personally I'd stay away from the regular battery powered ones.
http://www.amazon.com/gp/product/B00...00_i00_details
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