It seems to happen with all devices: you notice you don't get as much charge as you used to, and your iPad starts dying at inopportune times. Maybe it powers off when you still have 20% left, or just ...
It's strangely difficult to find out what your iPad's battery health is. Even now iPadOS 18 is here, there's no sign of a full battery health setting coming to devices other than the new iPad Pro or ...