I’ve thought about buying an external battery for my iPhone 3GS, but I never follow through with the purchase because the ones I’ve seen are always so bulky looking. I like the size of my iPhone and don’t want to turn it into a brick. It looks like I may have found the right external battery pack with the new MiLi PowerSkin. It has a capacity of 1200 mAh, is available in 8 colors and can be purchased bundled with the PocketPal – a very tiny folding USB charger. The MiLi Power Skin and PocketPal can be purchased through Amazon.com for $49.95 and $15.61 respectively and will soon be available at Phonemili.com
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Or you can get the fueltank uno. It is quite slim. Good thing about it? It’s compatible with 3000+ devices. I heard about it from this site http://bleedtravel.blogspot.com/2010/05/deals-coupon-for-20-off-fueltank.html