As described, your iPad may be in the early stages of battery failure.
Given that all Apple Stores are currently closed, you should directly contact Apple Support for assistance. The Support Team may be able to perform remote diagnostics and battery test - and provide appropriate advice.
The link to Contact Support is at top-right of this page.
I the interim, I strongly recommend that you ensure that you maintain a current iCloud or iTunes backup of your iPad. If total battery failure should occur, you data will remain safe - and, if needed, you’ll be able to restore you data to a replacement iPad.