Battery problems on Ipad Pro 2016

That iPad Pro model is over 5-years old, now.

ALL batteries degrade over time.

New iOS/iPadOS devices with brand new batteries, get UP to 10 hours of battery life.

I have two older 2015/2016, 12.9 inch screen iPad Pro models.

One gets between 4-5 hours and the other averages about 6.5 hours.

There is one thing left to try.

See if Apple will do a battery replacement of that older iPad model.

Be advised, Apple DOES NOT repair or replace batteries in iPads.

To expedite quick and speedy service, Apple and Apple store locations ONLY do in/out of warranty device replacement.

I am NOT even sure Apple will replace that iPad ( in lieu of an actual battery replacement ) as that iPad is pretty old, now, and may NOT have any replacement devices, of that vintage, to offer you as a battery replacement device.

If there is NO external, physical damage to that iPad, whatsoever, the costs for a device replacement, in lieu of an actual battery replacement, is $99 U.S.D..

You could try and 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!

You could always leave that iPad plugged into a power/charging source while using Procreate, instead of just relying on the iPad’s battery.

Okay,

So, you are convinced that this is not some sort of battery issue.

Since this is a refurbished device, it is most likely that iPad has a third party replacement battery installed.

It is a lesser battery that was replaced in this refurbished iPad,,though.

Both of my 2015/2016, 12.9 inch screen iPad Pro models still have their original battery Apple had installed inthese iPad Pro models and these batteries were 10,000 mAh hour batteries.

Both iPads together average about 5-5.5 hours of charge.

After ANY iOS/iPadOS upgrade/update, you should ALWAYS perform a simple hard reset of your Apple mobile device.

For iPad models with a Home button, do a simple hard reset of your iPad by holding down both the Home and sleep/wake/power button simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

OR

For much newer design iPad models, without a Home button, try the new simple hard reset procedure for the new 2018/2020/2021 iPad Pros, 2020 iPad Air 4 and 2021 iPad Mini 6 models.

1. Press and release the volume up button.

2. Then immediately press and release the volume down button.

3. Then, press and hold the single sleep/wake/power button You will see the Slide to Power off button, but keep on holding down the power button until you see the Apple logo, then let it go.

Once you have performed all the steps, wait for a few seconds and your 2018 iPad Pro will boot up completely to the iPad Pro’s Lock screen.

Things to try to preserve battery life, in case the Hard Reset did not work for you.

Tap on my ASC User tips link below.

Slow iPad on iOS 11, 12, and iPadOS - Apple Community

Some of of what i list to is bound to help.

Best of Luck to You!