IPad 2 with iOS 7.03 loses 12% of battery life in 24h. in Airplane Mode

Hi everyone,
I've always tried to maximize the battery life of my iPad; I fully discharge it and then fully charge all the time, and I don't do more than 1 full charge cicle per week.
In iOS 6 my iPad 2 was functioning nicely, with no noticeable battery drain in standby / sleep mode. The moment I upgraded to iOS 7 i noticed that my battery life was draining without using the iPad, about 1% per hour constantly.
I started to do a little bit of research. I made sure first that the iPad really goes to sleep when I close the smart cover.
I started to disable everything, one by one, removed all notifications, configured email to download only when I ask, disabled backgroun application refresh, closesd all applications before putting the iPad to sleep, etc.
I notice a little bit of improvement in terms of battery life in sleep mode but I still had a visible unacceptable battery drain in sleep mode.
I decided then to start real tests so I started to do the following:
- I fully charged it and fully chaged it
- when it reached 100% charge I kept it 2 more hours in charge
- I closed all apps and then I did a restart by pressing simultanously the home and the power buttons for more than 5 seconds
- I started the iPad, closed the smart cover to put it in sleep mode
- after 24 hours it was showing 87% so I lost 13%
Next test was similar but before putting the iPad to sleep I, put it in Airplane Mode. This time after 24 hours it was showing 88% so I lost 12%
One very weird thing that happened during this last test was that after 24h in Airplane Mode when I opened the lid, and without turning off the Airplane Mode I got a notification that there is a new software upgrade to iOS 7.04 waiting for me to install. REALLY in Airplane Mode . . . ???? I do not understand.
Have you noticed similar battery drain issues in iOS 7, did any of you performed similar tests ?
I consider 12% battery drain in 24 h. in sleep mode unacceptable, really unacceptable
My next test will be to turn it off for 24 hours to see how much is the battery draining when off.
Maybe Apple people have something to say. I have an appointment to the Genius bar today.
I'll keep you guys posted
Titus

Using the battery level meter in this manner is comparable to using your car's fuel gauge to calculate miles per gallon. The only thing that matters is the total amount of operating time from full charge to auto-shutdown.
Use the wall-mount charger that came with the iPad and charge overnight. Do NOT use an iPod/iPhone charger. Do NOT use a computer's USB port. Then, operate it normally until auto shut-down (ignore any low level alerts that may appear). An irony is that doing that test to determine the total operating time is also the procedure necessary to calibrate the battery level meter.
I'm not claiming that you do not have a problem. I am stating, however, that we don't yet know. If the above test does, in fact, indicate a problem, read this.
Also, according to Apple:
Use Your iPad Regularly
For proper reporting of the battery’s state of charge, be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).
Elsewhere, Apple elaborates and explains that two half-discharges (or four quarter-discharges, etc.) equals one full discharge.

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