Yeah I charge everyday as well. It’s what i use part for work along with my PC...battery has dropped from yesterday since downloading 13.5My iPad Pro is now my primary device. I rarely use my laptop anymore. I always charge mine every day, keyboard or not. I can go into a second day but wouldn’t make it through the whole day with the same usage. If you’re charging every or every other day it sounds normal to me. If that’s a big change for you then it may be something else. I do believe iOS 13 has resulted in more battery usage than previously but my Magic keyboard hasn’t worsened it much, very little compared to the keyboard folio that I also have. My guess is that battRey drainage issues is connected more to either software or increased usage. Especially for those who have seen their backlighting on even with the ipad locked.
it was off charge at 8am and at 17:40 it’s got 17% left.
8 hours, 30 minutes screen time.