The new iPad clocks in at 42.5 watt-hours, which works out to 11,666 mAh. That is a solid 70% boost to capacity over the iPad 2's 6,944 mAh battery. The new iPad maintains the established 10-hour lifespan standard, and even if you're active over LTE rather than Wi-Fi, you're still getting a very respectable 9 hours of life.