The new iPad uses 2-1/2 times as much display power than the iPad 2. It take 7 watts of power compared to the iPad 2's 2.7 watts for just the displays. This means that if you are plugged into a older 5w charger, you cannot stop the battery from draining while it is in use. Even the new 10w chargers could be challenged to keep up while the iPad is being used. A few little things can help keep the battery from draining as much. Keeping the screen brightness less than 50% is a maor one. Also using a smartcover will put the screen to sleep faster than just not using it. Push notifications can add up, so if you have your email off until you are where you can read it at your convenience, that will save you battery demand.