[4.4.0.64][Xperia 10 III] Backup/Restore reintroduced Battery bug

Brands, (fast-)charging standards etc is what would be relevant. Like, are they reputable? Is there a pattern? What about the charger that came with the device? Number of outlets and available amperage says very little.

This is not a thing - which makes me wonder if i should doubt more things.

But if you want to look at system logs, you can always (from the developer mode terminal) run:
devel-su journalctl -f
Probably best to enable ssh and log in that way btw, so you could copy anything interesting.
Although i still very much doubt it is a software issue.