Yes, I think the correct headline is "This page knows your battery charge level if you're using Chrome or most Chrome-based browsers". (I'm not sure if it works on all of them, although it does work on Arc.)
Does brave employ any anti fingerprinting measures?
Yes.
Represent ;)
Works on brave for me. Any idea what setting prevents this?
Not having a battery
Conveniently blocks all APIs
Checkmate liberals
Do you have shields on?
Yes, it says Shields are up for that page (the default until you say otherwise as far as I know). Fingerprint blocking is on. I disabled all cookies and it still works. I tried Safari and it is not working there. Pretty strange. v1.60.118
Brave for Android here. It justs reports that it's charging and 100%, neither of which are true. No extensions or weird settings.