I’ve witnessed an excessive amount of battery drain during use two weeks ago.
Full disclosurer: I’m using my 2020 iPad Pro 12.9 (wi-fi) as my main computer and currently due to COVID-19 as my work-from-home machine. I “am” a heavy iPad user.
I’m jumping between Outlook, Wordpress, Mailchimp, Safari, the Files App and iA Writer as my core productivity applications -within less than two hours of proper use, my iPad Pro’s battery went all the way down from 98% to 60%.
Hard resetting my iPad has all but completely resolved that issue for me, though! So I’d recommend everyone who notices increaded battery drain on their machines to do the same and see how that works out for them.
I still notice incrementally higher battery drain when the Magic Keyboard’s paired with may iPad compared to the Smart Keyboard Folio, though. Nothing dramatic, but what used to be a comfortable 9 1/2 hours of screen on time is now down to 8 1/2 to 9 hours for me. I guess that amount of battery drain is to be expected?
However: There appears to be an issue with apps like OneDrive and the NYTimes “constantly” refreshing in the background? Seems to be more of a software issue with iPadOS 13.5.1, than with the magic keyboard, though, and it didn’t noticeably affect my iPad Pro’s battery while it sleeps, as far as I can tell.