it uses a lithium ion polymer battery, charge it whenever you want it... for me i charge it if below 50% and take it out whenever i want to use it, regardless had reach 100% or not... never let it fall below 10%... if you are not using the network, then set to airplane mode ON... i'm happy with ipad my battery life...

refer this article: http://www.ipadmalaysialabs.com/how-to-max...r-ipad-battery/

i've installed Battery Go! Plus apps to keep track of the battery life....