iPad battery troubleshoot

These support pages should help with troubleshooting:

Charge and monitor the iPad battery - Apple Support

If your iPad won't charge – Apple Support

Troubleshooting generally requires substitution of the Power Adapter and cable for another known-good item.

If you continue to experience difficulties, you might be best advised to 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, Power Adapter and cable(s):

Genius Bar Reservation and Apple Support Options - Apple

If you already tried (to no avail) ALL the steps provided in the support article that led you here, I suggest that you contact Apple Support directly (they have tools to run remote diagnostics, battery included), using the following link:--> Get Support

Regards

Giulio

You are welcome