Please check this great review of the Galaxy S 3 4600mAh Extended battery from Mugen Power.
Currently this product is available for 87.95$ down from 98.95$ here.
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We are glad to announce that now we are offering 6 different colored back doors (red, white, black, grey, brown, black and blue) for our 4600mAh extended battery for Samsung Galaxy S III
Purchase this battery / Free shipping worldwide
You can also order the back door in desired color separately here.
The battery pack includes a leather case: