My friend design a portable power for all wireless include iphone, ipod, itouch, blackberry, sansung, etc. It is very powerful. Using 18650 li-ion battery (laptop battery core) 22oo mah, let you have double battery of your iphone (iphone battery is 1100 mah). It is a kind of iphone external battery or iphone backup battery. You can charge your wireless device any where, on the bus, airplane, subway. I always play game using my iphone on the subway train. The battery always dead in half hour. I hate this so much. So i am so happy i have this portable power, it is also a very strong flashlight. It is not like other back up battery or iphone external battery which you can not see the battery capability. That is means even they sell you "1100 mah battery" which real capacity is ony 500 mah. good luck everyone, dont forget check this wonderful product at http://www.oneotechnology.com/ .
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