The iPad Pro M1 charges extremely slow....it is taking 9 hours to get full charge. It is a new iPad just buyed 1 day ago.

You have 14-days from the date you received this iPad for a full return and refund of money or full exchange for another new device..

You need to search online for your nearest, “local” Apple store location and call contact phone numbers and call to make an appointment to have your Apple iPad diagnosed and options presented you.

Failing that,

You need to contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.

Use the Hardware Repair & Battery usage & Charging support categories.

OR

by installing and using the Apple Support app found in the iOS App Store.

Tap the iOS App Store link below.

https://apps.apple.com/us/app/apple-support/id1130498044

OR

Call contact Apple via the support numbers found in the link bekow.

Contact - How to Contact Us - Apple

Tap the link below.

https://www.apple.com/contact/

Best of Luck to You!

My iPad Pro 12.9 inch 5th generation is doing the same thing. I’ve had it charging with the original cable and charger for 40 minutes. While streaming video the device will hold steady at whatever % it’s at. To fully charge it takes overnight or all day with no activity

Are you using the supplied charger and cable?

Yes.

Should NOT be an issue.

Best of Luck to You!

See all of my comments above.

Best of Luck to You!