Apple always states 10 hours for every iPad even if every iPad having the same battery life isn’t true. With light, efficient, and low brightness use, I got 14 hours of SOT with my 9.7-inch iPad Pro on iOS 9 and 10 hours after it was forced to iOS 12; with the same usage, I’m getting around 20 hours with my iPad Air 5 on iPadOS 15; and about 26 hours on my 11th-gen iPad on iPadOS 18.
Apple has improved battery life significantly, yet… states that all of these models get the same 10 hours.