Battery drain faster? wifi+verizon 3g

Hi,
I have 32GB wifi+verizon 3g model of ipad 2. First few weeks I turned 3g off and had wifi always on. Usually I could get battery to drop 1 percent by using it for 6 - 9 minutes.
Recently, I don't know why, it starts to drain faster (4 minutes, 1 percent). I checked the forum, the internet. Some people reported the similar problem. So I tried:
1. turned everything off: push notification, location service, even wifi....
2. recalibrate
3. kill almost all apps in memory for multitasking
4. turn off PING
5. restore/reset
6. update to the latest software
Nothing above helps.... Of course if I use my ipad 2 in a room with a dim light then it could last longer, but in a normal lighting room, it just drains faster than before!
Why?? Please let me know anything else I could try. Or should I just go to apple store and get a replacement?

If a battery is rated for 10 hours (600 minutes), then theoretically, it will lose one percent every 6 minutes.
If you are losing an average of one percent every 4 minutes and you turned off everything in the list you posted, you may have a problem. If you can, take it to an apple store for testing. You can make an appointment on line at: www.apple.com/retail

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