The 3rd generation iPad came with a built-in 42.5-watt-hour rechargeable lithium-polymer battery, compared to iPad’s 25-watt-hour rechargeable lithium-polymer battery. It was a whopping 70% increase in the capacity of the battery.
Apple engineers were forced to pack a significantly larger battery in the iPad 3, which came with a faster dual-core processor, Retina Display and support for 4G LTE networks, to offer the 10-hour battery life.
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