Have you tried Acubattery?
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tried it, that’s the opposite of what I need. that app guesses what’s going on with the battery, based on prolonged usage patterns. I need something that talks to the battery controller and gives me numbers I can use.
It's accurate enough after a week or two, and the only way to get such a number on a unrooted phone afaik
It depends on the phone. Some phones will allow access, other phones will not. My S3 had the guess with acubattery, my moto e2 lte had acubattery read stats just fine from the controller.
Both ran custom roms
(S3 and e2 lte were on lineage os)