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The entire back and sides of the HTC Amaze 4G are removable to access the internals of the device. As you can see there is quite a large 1730 mAh battery inside too.
The HTC Amaze 4G is slightly narrower than the Galaxy S II with a bit smaller display too.
Both devices have 8 megapixel cameras, but I personally like the Amaze 4G back much better.