For older models of iPad that don't have the battery health feature there are commercial software packages available that can access battery cycle count for your iPad and iPhone. Popular choices for Mac are Coconut Battery and iMazing - whereas iMazing is available for PC.
https://www.coconut-flavour.com/coconutbattery/
The are also third-party shortcut scripts available that can semi-automate analysis of your iPad's analytics files - and provide a calculated estimate of battery health based upon the charge-cycle count. If this method is of interest, try using a Google search for "iPad battery health shortcut".
Caution: Be aware that running third-party shortcuts, downloaded from external sources, carry risk - in that they may not work, may be malicious, or may export private/sensitive data from your device. Use shortcuts entirely at your own risk; if anything goes wrong, you're on your own.
Recent models of iPad, most notably all that feature an M-series CPU, have a built-in Battery Health feature available from iPad settings - where you will find information that also includes Maximum Capacity, Cycle Count, Manufacturing and First Use dates for the device:
Settings > Battery > Battery Health >
More information about this feature can be found here:
How to check battery health and history on your iPad - Apple Support
If you are experiencing difficulties with your iPad battery holding charge, you might be best advised to 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
