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Help Problem with the battery and update

Kherax

Lurker
Hello everyone!
I am new on this forum and have joined it because of this annoying problem, namely:
My S3 that served me for a long, long time without any problems, suddenlt became useless!
The important thing is.. why?
Well, my battery literally goes from 100% till 15% or lower in about 15 minutes.
I never had this issue with any other phones, for instance my older phone (LG L5) which I gave to my father still works properly.
Now some details about my problem:
I always charged my phone overnight with no problems until since some days (maybe a week) the battery often doesn't charge fully, but even if it does, the battery goes away within 15-30 minutes.
I've researched about it and tried to do everything like loading the Battery doctor and Cleaner apps.
What's the weirdest thing is that everytime I close and open my phone (don't know the professional name :P) the battery goes about 20% lower everytime. And I tried to change my battery and get the same problem so it's probably my phone's fault! I tried to delete and close every process and software in background and still get the same. Sometimes even the screen is blinking (not sure if this is the correct word, it's darker and suddenly brighter and suddenly darker etc.)
I finally thought it could be because I didn't update it and had this update notification since a month but yet when I try to do it via Kies 3 (I have Android 4.3 on my mobile) it says:
PC Failed to recognise the mobile phone

 
Thanks for the useful information!
Today I will try to go to the service and I will see what will they say.
 
Well the battery drain problem is back and its seems to be from using a few apps thats temp going up and I can feel phone getting warmer as phone is losing power.

Also the Android Systems is taking main part of the drainage at 32% which is associated with a ton of functions so no way to force it to turn off.

I believe one app is causing the problem and why I want to find it as if I get another phone it will most likely be another G3 and would be setup same as my current phone which could end up having the same drainage problem
 
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In my case it's only 10-15% and I am a newbie so I don't really know what is G3 etc.
Although I have been to the service and they said my battery might be old and that's why it's happening. I will give it a try and get a new battery, they said they will pay me back if it won't work.
 
I used 2 new battery s and got a new charger and using new usb cables which helped when I found my usb connection to my phone was part of my charging problem as I had a bad cable I was using so now phone charges properly but still have this ongoing mystery battery drain problem which I think is a faulty app but cant I cant see one bad app showing the problem just the services showing the drainage.
 
I used 2 new battery s and got a new charger and using new usb cables which helped when I found my usb connection to my phone was part of my charging problem as I had a bad cable I was using so now phone charges properly but still have this ongoing mystery battery drain problem which I think is a faulty app but cant I cant see one bad app showing the problem just the services showing the drainage.
Well, I turned my fabrical settings back which means all my apps were deleted and still had the same problem. I used 2 batteries but both of them were, let's say, equally old and had the same.
 
Guys, I just got another problem.
When the batter is on ~23% the display starts to gravely weirdly reflect and the phone lags at the end.
 
Today the battery wasn't that bad (10% for 20 minutes), although there is a problem with the display flashing, and the death lag causing my phone to turn off.
I don't know whether it's a software problem but I can't update it even via Kies (I got an error at the end)
Service is too expensive (35 euro for software checking) and I am really desperated since I don't know what to do and a new phone is not the way :(
Any ideas what can I do/check?
 
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