I still can't get the new battery stats to work right and even if I did, they're awful compared to the old SOT/Standby readings from previous iOS versions. I can only say, I haven't noticed any difference in battery life, at least 10 hours before I need to charge. Of course, that changes when I play intensive games or watch movies..
I have a 10.5 2017 iPad Pro and battery life is okay. I had to change my notifications around since everything from my phone was also coming to my iPad. I don’t use it much so I get about 2-3 days per charge.