These battery stats on my 6a has been... interesting...

https://sh.itjust.works/post/3940346

These battery stats on my 6a has been... interesting... - sh.itjust.works

I’ve been using the 6a since the start of this year, and alongside it Accubattery to remind me to unplug my phone whenever it reaches 85% charge. I know Accubattery stats are just an approximation, and I’ve only been using this phone for half a year, but still quite amusing to see the battery health go up instead of dropping.

You should let the battery go to zero and then charge to 100% from time to time. Accubattery recommends once a month to avoid these kind of odd values I believe.
I did do that a couple times. Maybe I should do it more often.