I was looking at this chart in AccuBattery and this dip looks rather strange. It does not look like normal battery wear. Did we get nerfed by the July update like the a-series with bad batteries? What’s your graph look like, if you use AccuBattery or equivalent?
For what it’s worth, that app can’t access battery management stats at the system level. It just estimates based on factory specs and basic battery telemetry accessible to userspace apps like charge percent. The app power usage stats the OS provides is heavily flawed at the OS level, not all power consumption like modem behavior is captured accurately or at all.
So, tl;dr, just guesses and is of very limited usefulness. It does increase battery consumption slightly though, which… doesn’t really help.