Galaxy S3 Weird Battery Issues

[AC Question]

My Samsung S3 has a weird and inconsistent problem. Generally I assume my phone will lose ~5% battery charge over the day with moderate use. I'm OK with that. Here is the problem. I go to bed and put the phone on the Samsung charger and the battery at ~50% charge. Next morning I wake up and with the charger still connected the battery is sitting at ~55%. I remove the charger cable and in a couple of seconds the battery says it is at 100%. But within ~20 minutes it has fallen steadily to 55% again. I put the phone on the Nexus 7 charger and get ready for work and it charges nicely to say ~75-80 percent and then continue to charge the phone on the car charger for another ~30 minutes and I might be close to 100% charged. It then loses ~5% per hour thereafter.
I note that I have fooled with the apps, use WCDMA only etc. Also if you lose 50% battery in 20 minutes it generally means the battery would get warm.
I suspect my charger and right now I am experimenting with different charges. My worry is that it is the charging software (hardware?) in the phone.
Comments, help, similar issues?
JohnB

 

[Golfdriver97]

Your battery may be going bad was well.

Signed, a Nexus 5, AC forums app, and Android L.

 

[belodion]

I assume the 5% in the third line is an error...surely you meant 50% loss of charge after a day's use. If you charge your phone overnight, even from a low starting charge, it ought to reach 100% well before you wake up. Those additional charges you're giving it I don't understand.
Here's me with Nexus 5: charge in the evening to 100%, stop charging, go to bed. Morning, 2%-5% lost overnight. After use during the day, I'm down to no lower than 20% charge by the evening, with quite heavy use, when I charge again.
I'm wondering whether your charger is the culprit.

Posted via Android Central App

 

[belodion]

(I hadn't realised that Golfdriver97 had replied, but yes, possible battery problem as well.)

Posted via Android Central App

 

[Golfdriver97]

(I hadn't realised that Golfdriver97 had replied, but yes, possible battery problem as well.)

Posted via Android Central App

Probably posted at the same time. No worries.

From a Carbon M8 and AC Forums app