MUSINGS: The iPad Air has a 32.5 Watt Hour battery. Some older iPads had a 42.5 Watt Hour battery and can consume more energy to charge than the current Air model does.


AIR: If we figure the average Li battery voltage in the iPad Air is 3.6V then: 32.5Wh/3.6V = 9.03 *1000 = 9028 mAh battery (approx size).


OLDER MODELS: If we figure the average Li battery voltage in the iPad 2,3,4 is 3.6V then: 42.5Wh/3.6V = 11.81 *1000 = 11806 mAh battery (approx size).


Keep in mind that most electronics makers are not using the full range of the internal Li batteries in order to get the most life out of them. Consumers hate short battery life in products where batteries are not easily replaced.


They are likely using somewhere between 60% and 80% of the actual mAh capacity but this is kept under wraps... If they used the full rated capacity it would take a lot more than 5.64Ah's to recharge the iPad Air...