If you are not currently surfing the web, checking your emails or browsing the iTunes Store (or anything else that requires an active internet connection), turning off wireless on your iPad is a great and easy way to save on battery life. Whether you are surfing or not, your iPad needs to regularly check the WiFi connection to make sure that it is still active, and obviously also uses power when you are receiving or sending information online. This tutorial explains how to quickly turn off WiFi on your iPad (temporarily disable your wireless in other words), and how to re-enable it later on.
Follow these steps to turn off the wireless radio and save power:
When you manually disable wireless on your iPad, it will respect your decision regardless of needs: if an application needs internet access, you will generally get a notification of some kind, but applications won't re-enable WiFi automatically.
To turn wireless back on for your iPad, simply follow the steps we outlined above: when you get to t "Wi-Fi Networks" screen, simply tap the "Wi-Fi" switch (which should read "Off" if wireless is turned off).