Not charging/Dying fast

[Android Question]

I have a Samsung Galaxy S3. My carrier is with Cspire. It seems like after this recent update my phone is dying fast. It takes all night to charge and then it will only charge to 70% if I'm lucky. I have a new battery and charger. The new battery said it was charged through the night, but when I took it off the charger this morning, it died saying it was not charged at all. So, I put my old battery back in. Still takes forever to charge and I was on my phone for 2 minutes (just sending a text) and it went from 54%-48%. Is there a quick fix for this, or do I have to go and get the charging port looked at? This phone is not even a year old yet. I had this problem a few months ago and I bought a new charger. That did the trick until this recent update.

 

[Rukbat]

If the battery is charging (at all), there's nothing wrong with the charging port. It either works or it doesn't.

What you have to understand is that the thing you're using is a battery charger, not an external power supply for the phone. A USB 2.0 port can't supply enough current to both charge the battery and run the phone, so while the charger is charging the battery the phone is using current from the battery.

The update may be running something in the background that's using more current, so the charger can no longer supply enough current (and, short of making the world accept a new spec for USB 2.0, there's nothing you can do about that) while the phone is running. Turn the phone off, plug the charger in, let it charge to 100%, then see what kind of life you're getting. (Also check with an app-killer app to see what apps are running. Don't just kill those you don't need, change their settings so they don't start up on boot. NEVER do that to a system app, though - if you don't know what the app is, leave it alone. Stopping the wrong app could keep the phone from working at all.)

If charging to 100% with the phone off still gives you short charge cycles, this may be a new bug with the 4.3 update. I've never heard of this particular one - yet.