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I have tried a few of the so called 4500 mah batteries on Ebay that claim to be the same size as the original battery and use the original back cover. None of them were any better than the original, which stands to reason because they all weighed exactly the same as the original. (To achieve a higher capacity with the same size cell, a manufacturer would have to pack more lithium into the same space. Even if that was possible, a more dense lithium cell would need to weigh more than an original. These don't.
I am now using an Anker 6400mah battery which is twice the bulk and weight of the original. If you look at it closely, this battery appears to have 2 original size cells stacked together. So it genuinely gives you twice the battery time. Being thicker, it, however, requires a different case back that comes with it. Adding a cover to this increases the bulk a bit more, but I find the more curved back fits the palm of my hand better. But carrying the phone in your pocket becomes more difficult, although not impossible. I ended up buying the Seidio case/holster combination which is meant for their 4800 mah battery, but fits the phone, with the Anker 6400 back, perfectly.
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