There is a work-around to get battery health that works very well, very fast once you download the Shortcut at the end of this article. Once that’s installed the process is simply to Open settings> Privatcy&Security>Analytics&Improvements> Analytics Data> tap top, most recent analytics file. Then share>run the shortcut from share sheet.
The full article link below for reference. The shortcut they provide is here: https://www.icloud.com/shortcuts/919f0727987843098761b7a506eefbf2
And for what it’s worth my M1 iPad is, after 2.6 years of use, going to need a new battery at some point in the next few months.