Baldsparrow Said:
“Thanks but those don’t help my situation. As I said, immediately after installing iPadOS 14 I started having quite dramatic battery drain problems“
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You are Welcome.
Try a Backup then Restore from it:
Anything messed up after the update would be fixed.
I. First, Backup your iPad.
I would plug the iPad into the wall, and, while plugged in, backup your iPad to iCloud or to your computer. While it is plugged in be certain all necessary items are set to be backed up. Choose what to back up: Open: Settings > Tap: your Name (The very-top item) > Tap: iCloud > Tap: iCloud > Tap: Anything Necessary so it is Green. Next, proceed with the backup Go Here: Make a Backup on your iPhone, iPad, or iPod touch.
II. Restoring this From a Backup:
Have you backed up your iPad at all prior to this update install? If so, restore from it. Go Here: Restore your iPhone, iPad, ir iPod touch from a Backup.
If that does Not Work...
III. Set the iPad up anew. Perform as Instructed Here: What to do Before you Sell, Give Away, or Trade in your IPhone, iPad, or iPod Touch -Apple Support. Once that is done, restore from the backup using the link in Step II.