HT4623 iphone 4s drains faster after iOS 6.1.2 upgrade

Got message saying need to upgrade to iOS 6.1.2 to prevent or repair problems causing battery to drain quickly, which was happening recently.
Udated software and battery still drains way too fast.
Is Apple aware of this?
What are they doing to fix it since it appears to be a software issue?

Generally this is a sign that the iPhone had previously been
hacked/modified/jailbroken and the update relocked it to the
original wireless carrier. If this is the case, only that wireless
carrier can unlock your iPhone. You must contact them to see
if they offer unlocking and if you qualify.
Where did you acquire this iPhone?
What wireless carrier did you use before this problem?
Does the app Cydia appear on your iPhone?
What does it say when you look at Settings=>General=>About=>Carrier?

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