iPad battery dysfunction

The symptoms that you describe are typical of a failing battery that has reached the end of its usable lifespan - and requires replacement.

You might be best advised to seek assistance directly from from Apple Support - and request a remote diagnostic test. You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:

https://apps.apple.com/gb/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad - and you’ll be able to explore your available options:

Genius Bar Reservation and Apple Support Options - Apple

Is this an older iPad? I ask because, this appears to be a hardware issue and it is, more than likely, a failing battery. I recommend that you have your iPad examined at the Apple Store or at an Authorized Service Center for further diagnosis and a resolution.

Axel F.