iPad Pro 11 - not able to charge with iOS 15.2 & 15.3

As described, your iPad battery may have a fault. These support pages should help with troubleshooting:

Charge and monitor the iPad battery - Apple Support

If your iPad won't charge – Apple Support

Whilst acknowledging that you may already have tried some of this, 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 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, Power Adapter and cable(s):

Genius Bar Reservation and Apple Support Options - Apple

I am having this exact issue. Battery life wasn’t as long with 15.2 but as soon as I updated to 15.3 I cannot get it past 2% at the most, even with a brand new apple c charger. If I try to use it while plugged in I can maybe use it for 3 mins before it crashes again. I have forced restarted and done everything I can think of. This is beyond frustrating