Try some of these trouble shooting steps as they may aid you in diagnosing the problem:
***Perform a Battery Health Check***
* Use a tool like ***CoconutBattery*** (Mac) or other diagnostic apps to check battery health and charge cycles.
***Perform a Hard Reset***
* Force restart the device to clear any temporary software glitches.
***Recalibrate the Battery***
* Fully discharge the iPad until it powers off, then charge it uninterrupted to 100%.
***Monitor Power Consumption***
* Go to ***Settings > Battery*** and review which apps or services are draining power. If the screen is disproportionately consuming battery, it points to a hardware issue.
These may aid you in diagnosing the problem as a hardware issue or a software issue.