iResQ got their hands on one of the “iPhone 5” batteries and posted new photos showing the battery in the iPhone’s rear shell and next to an iPhone 4S battery for comparison. The photos show that the new battery is slightly taller than the iPhone 4S battery, and the thickness appears roughly the same despite the fact that the new iPhone is expected to be at least 15% thinner than the iPhone 4S.

Key differences between the iPhone 5 and the iPhone 4S battery:

1. The iPhone 5’s battery is slightly less than a half an inch taller than the iPhone 4S. The thickness appears to be identical.

2. The iPhone 5 is 3.8V/5.45Whr while the iPhone 4S is 3.7V/5.3Whr.

3. The connector on the iPhone 5 is not only different, it is placed on the opposite side of the battery to accomodiate its new position within the iPhone.

Source [Macrumors]