How to check your iPad battery health on older iPads (pre-2024)

https://www.tomsguide.com/how-to/how-to-check-your-ipads-battery-health

You need to go to Settings > Privacy & Security and enable Share iPad Analytics. When you have done that, need to wait for a day or so, before there are Analytics files in the Analytics Data folder. Which you can then look for the “last_value_MaximumCapacityPercent” value. Or you can install the Battery Stats shortcut (by Reddit’s r/iPad and users u/nairazak and u/ericswpark) which will help you to get that info quickly.