Update: Even in airplane mode, iPad Pro 2018 draining battery. Back @85deg F, center above logo @95. For comparison iPad Pro 2015 @75 EVEN IN USE.

Wish I could post picture here - constant linear battery drain with zero activity recorded. I have iPhone 8+, iPad pro 2015, and iPad Pro 2018. ONLY HAPPENS ON iPad PRO 2018. The biggest difference I see in settings is the 2018 has “Privacy Warning” on WiFi (the other two do not). iPhone & 2018 have iMessage, 2015 does not. I strongly suspect the “Privacy Warning” on WiFi is causing wifi to constantly search/change networks. When I had two networks saved it would always do this visibly when I disabled/enabled WiFi. Also it takes FOREVER to connect to WiFi now that this “feature” has been added.