iPad uses charge too quickly

If you are experiencing difficulties with your iPad battery holding charge, you might be best advised to first have your iPad tested. 

If you directly contact Apple Support - and explain your problem - you can request a remote battery diagnostic. The tests will confirm the status of your battery - and other elements of your iPad’s health.

Alternatively, a visit to the Genius Bar at your local Apple Store would provide opportunity for your iPad to be similarly tested by the Apple technicians - after which you can explore your available options.

Genius Bar Reservation and Apple Support Options - Apple

You can contact Apple Support using the Contact Support link at top-right of this page. You can also initiate a support case 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

This sounds like a hardware issue, you can make an appointment at an Apple Store and have them test your battery.

Genius Bar Reservation and Apple Support Options - Apple

If you don't want to make an appointment you can check your battery health by going to Settings > Battery > Battery Health. If the “Maximum Capacity” is less then 80% you should look into replacing your iPad battery.

iPad Repair - Official Apple Support

Edac07 wrote:

If you don't want to make an appointment you can check your battery health by going to Settings > Battery > Battery Health. If the “Maximum Capacity” is less then 80% you should look into replacing your iPad battery.

The battery health feature is exclusive to iOS for iPhone.

iOS/iPadOS for iPad has never had the Battery Health feature.