There have been recent media reports suggesting that if you leave your new iPad plugged in after it reaches a 100{813a954d5e225a1509f22204ece89c855080ce25555f20805f61bed63cbfde3b} charge, it could harm the battery. Macworld decided to do some research on these claims and concluded that they were false.
Your new iPad’s battery is fine. Despite some media reports suggesting that Apple’s newest tablet suffers from a pair of battery-related issues, Macworld’s own research concludes that the third-generation iPad’s battery works as designed, and that customers needn’t fear harming the battery by over-charging it.
John Gruber of Daring Fireball makes a great point:
Why would anyone believe that Apple, of all companies, would design a product that gets damaged if you do the obvious thing and simply leave it plugged in overnight? Some outfits are so desperate for negative iPad stories that they’ll report allegations that don’t even make sense.