Often times, you get apps running that are acquiring satellite data or your bluetooth receiver might be active. Because the iPad is never really turned off (it just goes to sleep) apps can remaining running, in the background, after you think you've closed them out.
Here's my first recommendation:
Reboot the iPad by holding the home key and power button, until the white apple appears on the screen. This might take as long as 10 seconds, so be patient. You will not loose any data by doing this.
Try to determine if your battery life is any better.
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