Now there is a new backup battery for iPhone 3G/3GS, it is high capacity 3000mAh,slide iPhone 3G/3GS into iPa Sliding way to supply power to iPhone 3G/3GS, and there are three led indicators to indicate the situation.
The price is just $25/pcs.

If you are interesting in it, would you please contact with me by info.mikesang@gmail.com or skype: mike-sang

Best rgds,
Mike Sang
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KAYO Industrial Company Limited
Kayo Battery ( Shenzhen ) Co.,Ltd.
519#,Chaohui building, Baohua Road, Longhua town,
Shenzhen City, Guangdong 518109, P.R. China.
MP: 8613798920804
Skype:mike-sang
MSN:mikesang-111@hotmail.com
Tel: 86-755-28117967
Fax:86-755-28117957
E-mail:info.mikesang@gmail.com
Web: http://www.kayobattery.com