Battery drain
I have iPad pro having a battery issue when not using it. Initially iPad drain only 1% or not at all drain over night but now from last 10 to 15 days it drain upto 10% or even more.
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First ensure that you have updated your iPad to the most recent version of iPadOS - at time of writing, this being iPadOS 15.5.
For a few days after a system software update, you can expect to see higher than usual battery utilisation while the iPad is idle - as background housekeeping tasks, such as re-indexing of the iPad filesystem, will be running. After a few days, battery utilisation should return to normal.
You can check which Apps are running as both foreground (active) and background tasks by looking at your battery statistics. You will see a breakdown of App activity by individual Apps. More information about tracking App activity can be found here:
About the battery usage on your iPhone, iPad, and iPod touch - Apple Support