With the razr coming out and not having a removeable battery and how most 'power' phones drain batteries like their is no tomorrow. I know motorola makes a portable backup powersource, but I just found this and was wondering if anyone has any experience with it? Amazon.com: New Trent ifuel IMP500 5000mAh External Battery pack and Charger for Apple iPhone 4S 4 3Gs 3G (AT&T and verizon), iPod Touch (1G 2G 3G 4G 5G), Motorola Droid, HTC Android EVO, Blackberry, Samsung EPIC, Samsung Galaxy Tablet, Samsung Galax