Hi everyone,
After multiple tests with my new iPhone 5 (bought it one week ago), it shows that the main source of the battery drainage (for my iPhone at least) come from 3G/EDGE auto détection.
If only i could switch off only 3G to stay on EDGE only (like on my iPhone 4), i'm sure that the battery would stay charged longer.
But if you are in a place where you just have a little 3G signal, that's when your battery will discharge the fastest because off the neverending network scan.
I was very familiar with all battery saving params et techniques since ios 4.x and i always clean open apps before lock.
The problem is that you can see the battery draining just by sending iMessages or loading your mails.
I tried this the night before: All night without cellular data and with wifi activated
And this last night: All night just with cellular data
Results:
-Without cellular data and wifi: lost 3% of battery during the night
-With cellular data only: lost 40% of my battery during the night
The apps i left open during night were Messages, Mails and Facebook (v5)
I'm not asking for a big solution right now, but if only a least, apple could réactivate the 3G switch off button (if possible), i think that would be a great thing to calm down battery drainage.
(Yes EDGE is slow but for the majority of everyday apps, it is sufficient. Plus if necessary you can reactivate 3G at will)
Hope i helped.