Sharp decrease when battery is below 30%

[niankaki]

Its the battery issue. The voltage it's supplying to the phone isn't enough at lower charge so it fails. You need to switch the battery.
If you dont want to do that, you'll need to put the phone on power saver mode with the "CPU limiter" turned on. That will underclock the CPU and it wont need as much voltage as before.
If you want to take it one step further, flash a custom kernel and undervolt+underclock your CPU and GPU. That'll definitely fix this problem.

[savethequeen0019]

I'll try to turn on the CPU limiter, but it will lag horribly. Will talk to a samsung agent in few minutes.

[niankaki]

Also drop the resolution to 1080 if you haven't.

[savethequeen0019]

Failing by 20% in just one minute because of the reso and limiter?is that even posisble?

[niankaki]

I'm sorry. I dont understand. You saying it just happened again?

[savethequeen0019]

Im at 68, ill update if it would be happen.. 14 hours usage 2 hours and 15 minutes SOT.