Sudden Battery drainages on two independent iPhones simultaneously

Hello,
During the last few days I've experienced episodes of fast battery drainage on two different iPhone4.
The battery drainage that has started occuring (at different paces / periods of the day) is markedly more rapid than compared to normal "heavy usage".
E.g. a nearly fully charged phone suddenly is "dead" in the morning.
This has started occurring on two different iPhone4s.
Thus I interpret the reason to be IOS 5.0.1 (built in apps or settings, iCloud or something else) or some other apps that cause this to be happening now.
The latest IOS software, iCloud and Exhange accounts are running as usual, but this has never been a problem before.
So I guess that it might be some minor setting feature, e.g. reminders settings, or some other iCloud connectivity / data-worksessions, GPS activity (hidden) that could be causing background drainage.
I don't know.
Any suggestions on how to figure out. And please do not suggest that exchange sevices with push, iCloud ON etc. should be turned off - it has worked fine without battery drainage till now.
Kind regards,
Martin

Theoretically, any app that uses "push" technology (more and more will with OS3) may be causing the problem. Try disabling all "push" apps and see if it helps. I referred to Exchange Email, only because toggling push on and off impacted the problem absolutely.
Did a restore to "new phone" fix the problem? If so, you can try what I did which is to load each app directly to phone and see if it causes the failure to charge and heat.

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http://supportforums.blackberry.com/t5/Device-software-for-BlackBerry/How-To-Reload-Your-Operating-S...
When restoring your data, just to be safe, choose to do a selective restore and just pick the things you need (e.g. Address Book, Calendar, Messages, etc). Like this, you'll be sure that you aren't transfering a potential problem back to your BB.
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Sudden Battery drainages on two independent iPhones simultaneously

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