Ok, so I checked the voltage when full with gsam, and it's 4.3. I know 4.2 is the limit but ever since I got my phone (and was on factory firmware) it was around 4.3 so I don't see anything unusual there. Battery didn't deplete at all, I usually charge it to 80% and let it drop to 20-30, it gets me throughout the day. I don't use kernel tweaks so I don't see the point of flashing dori if stock is not causing any problems.
So, does anyone have an idea on figuring out this 10h SOT? Should I check the voltage when empty? What would be the parameters (full-empty) for a half a year old battery? Should I even be worried about this?