i had the same issue with a new iPad Air.
took it in to apple and they ran testing and said no issues came up with batter.
battery health is 100.
I lose about 20% of battery per hour.
I get 5 hours Max on a full charge with full brightness.
I feel like we’ve all been scammed.
I traded in an iPad Pro gen 3 for this newer smaller iPad.
at the store the apple employee looked up battery life between my old iPad and new iPad Air and it clearly states 10 hrs of bagger life on video playback or safari browsing.
I had them restore it. Started from scratch. Same thing.
took it in. They replaced it.
guess what. My replacement is no different. 20% use per hour.
updated to most recent iOS.
I have ZERO notifications on iPad.
I have Background app refresh turned off.
this is utterly disappointing and unacceptable…
wish I had good news… believe me.