I had the same problem, battery draining REALLY fast! I took it to a repair, and to phone booth I had bought it from in mall, they both had no idea but the repair guy said "it is the Motherboard". I took it home and played with it, googled it, tried looking at it really well and came up with this. I had had an update about a few days previously, my home screen pic was gone and a couple of minor irritants as well. Then this started. So I looked at phone and wondered what else update may have done in changes. I saw two flashing icons on Lock screen, googled what they were and why I had not noticed them before (flashing). It cam up in one of the posts that the icons on lock screen cannot be used in "Easy Mode". I went into my settings and turned my Mode to Standard Mode (or whatever yours is called, just don't have it in Easy Mode). I also removed my camera icon from the Lock Screen, as in my Battery in settings it was showing that my screen was drawing all the battery power. So I eliminated that icon, just in case. I had never noticed it before, so it may have not been there before update, anyway. One more thing I did was clear my Cache, and this is how to do it..... It won’t delete anything, it is something you should do before updating your phone, but I did not know this prior. Now I do it.
1. Turn off phone
2. Wait 5secs
3. Hold up volume button, home button, and power button until phone cuts on
4. Let go of power button
5. When Screen comes up let go of all buttons
6. Use volume button to go down to wipe cache, use power button to select
7. Then press select reboot system
I will never know which of these things I did that corrected it, but afterwards it was back to normal. My opinion was that I changed it back to Standard Mode, and I had not put it into Easy Mode, that came with the update changes. Anyway, then I topped it off by downloading one of the Battery Saver apps, and it is
phenomenally better!!! I used Juice Defender, but there a number of them and they are FREE. Now my battery life does not move! Good luck with this
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