Q: In the new iPad update how do I shut down apps running in the background to preserve battery life?

Double-click the Home button and swipe up on the app screen to remove the App.

in iOS 7, double click the Home Button (the round one on the front).

You will see icons for all open apps with a 'screenshot' above each icon. Simply drag any 'screenshot' upwards using 1 finger to close the app.

Most apps don't use much power when inactive but some do including Sat Nav apps