I read on a few ipad forums that the battery should be calibrated once a month.
or every other month. i have not done this yet. my battery is about 22 percent how low should i let it go before i recharge it to 10 percent or under 10 percent and some people say it dont have to be done lol.
i got my ipad around may i guess.. so i plan on doing it this time tomrrow or wensday