I installed the new iPad OS 13 last night on my iPad pro from 2018. I woke up this morning with 100% battery. And just 3 hours of use later my battery is down to 50%. Normally it would be in the 80-90% range. Has anyone else noticed this battery drain?
I haven’t noticed anything to the degree that you’re describing.
While it’s not as bad as setting up a device from scratch, upgrading to a new version of the OS can temporarily increase energy use as various caches get repopulated, new on-device machine learning algorithms are run, etc. Might be worth keeping an eye on over time and seeing if it gets better.
Could be that, plus I’m giving it more of a workout, trying all the new features, including scanning documents which I hardly ever do on my iPad. Maybe some of them are buggy and causing a power drain.