Buy those with usb port that chsrge ipad or tablet with output 2A. Good ones are Griffith n kengsington
It will not spoil your phone unless you use cheap imitation batteries whose temperature goes up frightening high

Spend a little time , search thru Garage Sales and get the answer yourself la ..... Benny is here to help , not 2 help in updating pricing for AP or SME set la

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Added on September 11, 2011, 4:49 pm
Ya mah , when the 4th fruit was intro and everyone knows about the reception issues , nobody cares and still buy it n dont mind using a " condom " over it since it's free  .... When sensation or even incredible S got some death grip issue or even SGSII with the yellowish display or pink camera spot, ppl r making such a fuzz over it , considering this and that , blablabla and these issues are not in every unit unlike those " fruity" devices .