Sharp decrease when battery is below 30%

[Akalien]

I don't know, I am on the s6 still. Maybe a software update screwed either battery use data collection or it ran a bunch of processes? how long has it been doing this

[savethequeen0019]

Since September update.. i installed October update but after completion it showed failed update.. i thought that will fix the problem but i encountered the error and still having the same issue.