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just asking. does Apple replace the battery of an iPad 2 if it goes below the normal level like it does for macbooks?
 
Do you have exchange with Calender support enabled? I had an issue with my iPhone 4 when I bought it that it would die within 8 hours. After about a week of investigation I found out that it was actually my calender that was causing it. I had numerous meetings setup in my calender that didn't have an end date, they were on going until the owner canceled the meeting. This caused my iPhone to always be updating to the calender trying to get another meeting invite for the following week. I went into outlook and modified all of my meetings to an end date of like 2 years out and it fixed it.
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

Op did you restore from a backup when it was new? If u did restore is as a new device
 
Auto Brightness

I don't think this is an auto brightness issue because I'm always on default settings and I've been using my iPad for a month, and I have no complains about the battery life.

Have you tried closing the apps that you are not using? closing them from the multitask bar, that's what I always do... I just keep the Facebook, Twitter and Safari apps for quick loading.

another tips...
- Don't you ever! place the iPad on top of hot places, like your PC monitor
- Set auto lock screen to 1 minute
- Turn off equalizer on music
- Once a month, drain the battery and do a full charge
 
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