Does exactly what it says, practically no faults,
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This review is from: New Trent Power Rock Case with Extended Rechargeable Battery Juice Case 2100mAh for IPHONE 4 4S (IMP210B/NT210B) (Wireless Phone Accessory)
I bought the New Trent case after buying two Mophie Juice Pack Plus cases. The first Mophie Juice Pack Plus was great, as good as the New Trent, but it stopped working after some apparent damage. Something dropped on it or pressed on the case where the power plug goes in. I bought another from a different Amazon retailer, but it turned out to be a fake. The retailer refunded me, no questions asked. New Trent appears not to be plagued by fakes.
So I tried the New Trent equivalent. It's a little less attractive than the Mophie, but it is slightly more solid and the fit is better. The join of the two halves of the case is almost invisible. It is slightly more brick-like in its appearance but is more or less the same spec, similar lights, similar holes for the music to flow out if you want to use your iPhone as a mini-boombox. Mophie may have a slight edge in music playback over the internal speakers due to their design, but it's only slight, both allow a fairly rich sound but it's slightly muffled by the New Trent case.
Some reviewers found fault with the case for affecting the camera's abilities, such as a tendency to flash or some reflections on the image, but I had no such problems, I thought the case gives good extra protection of the lens from finger smudges.
Battery life is what you'd expect, comfortably twice what it would be without a battery case.New Trent ultra slim-fit case IMP220B with Extended Rechargeable Battery Juice Case Air for IPHONE 4 4G 2400mAh