The new iPad guts are nice, at last with 1GB of much needed RAM to accelerate all that web browsing. But the most impressive thing is the new battery, which takes most of the space. It's a gigantic 70-percent larger!
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The iPad 2 had a 25-watt-hour Li-ion battery. The iPad 3 has a 42.5 watt-hour battery! That's 70-percent more than the previous capacity. 70-percent more magical battery unicorns, people.
The battery life hasn't changed, however: it's still ten hours of use, nine with average use of the cellular data network. So why the increase? Obviously, that big screen and the more powerful processor are hitting the power big time. [ifixit]