Hmmm. 
Apparently people experiencing battery drain due to 5G since A13 are on “Sunrise”? This is probably something to check. It would mean it’s carrier-related (some configuration).
Welcome to you two newcomers, and please note that the issue is most likely a composite one, since many users have a battery drain issue which is independent from 5G. I for instance am experiencing battery drain since A13, but it’s clearly independent of 5G (Orange FR), since disabling 5G doesn’t change anything.
This means you “5G-drain” people probable have two independent yet cumulative issues, which will most likely increase the difficulty of fixing the problem. 