Protecting well as fill the batteries, so this dual function cell phone gadget accessories which are presented specifically for the iphone 4. The package is so slim with 1200mAh batteries capacity and with a choice of colors of red, white and black

MyPower for iPhone 4 is a new technology from Tekkeon's innovative eSwap,equipped with lithium polymer batteries, which can be charged simultaneously with theiPhone 4. This cell phone gadget provides security with advanced battery technology including a built in protection from charging too long causing heat

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Tekkeon MP1200 myPower Battery/Sleeve for iPhone 3G, 3G S (Black)  myPower for iPhone MP1250  Tekkeon myPower Rechargeable Battery Case with Replaceable Battery Module for AT&T and Verizon iPhone 4 (Black)