My iphone 4 upgraded to ios6.1.2 and the battery drained very fast.

ios6.1.1 seemed much better than 6.1.2. The new version is a disaster for battery.

Did you perform the upgrade by plugging in your phone and upgrading through iTunes? I had the exact same issue happen before because I did the upgrade through WiFi. I spoke to an Apple representative and they said that upgrading over WiFi can sometimes cause this issue. To check if you had the same problem as me, go to Settings, General, Usage, and scroll to the bottom. Look at the section called "Time since last full charge" and you'll see "Usage" and "Standby". If those two numbers are equal, they shouldn't be unless you are constantly using your phone...
Unfortunately, the only way to fix this issue is to restore your iPhone via iTunes (if you have the problem I described). However, you you back up your phone prior to restoring it, you should not lose any of your data, but all of your settings will be reset to default.
I hope this helps.

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