Very useful in case of emergency,
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This review is from: Veho 2200mAh Pebble Smartstick Emergency Portable Battery for iPhone/Blackberry/Samsung/HTC/Nokia - Purple (Electronics)
Do not expect the battery will transfer full charge to you phone, but at least can charge a half or maybe 3/4 at best. but it is very uselful in case of emergency. The only thing I could complain is the accesories, they are not good quality. I used the cable with the micro USB for Blackberry an it bent and broke in less than a month. But I am happy with the charger itself.