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Whenever a new product s released to the market, iFixit is quick to unscrew, de-glue, and unhinge every part of it to reveal more about the device. The teardown of the new iPad Mini with retina display confirms suspicions about the devices battery and a few other things.
As you can see it the teardown below, the second generation iPad Mini has a bigger battery 6,471 mAh battery (24wh). Thats a bump from the 16.3Wh found in the original iPad Mini, but the change wont translate to any noticeable benefits in power. The addition of a retina display and the new A7 processor use up more energy. As a result, the iPad Mini with retina display retains its 10-hours of promised battery life, the same as its predecessor.

Heres a video showing the rest of iFixits findings.