I recently updated my iPhone 4S with the new operating system and since then my battery loses it's charge very quickly. I also can't seem to close the applications like I use to with the old system.
First, try rebooting it:
Rebooting your iDevice
Hold down the Sleep (On-Off) and Home buttons together for about 10-15 seconds or until the Apple Logo appears - ignore the red slider if it appears - then let go of the buttons. The iPad should begin to start up.
If that doesn't help then restore it: Backing up, updating, and restoring iPad, iPod touch, and iPhone software
Retrieving data ...