I've had both the wifi only and cellular model iPad 2017 along with a bunch of other iPads before that. But anyway, some quick backstory. I noticed a significant battery life decrease when going from a wifi-only iPad to a cellular iPad. I realized that even when I was on wifi, having the cellular radio on decreased battery life. In theory, Apple should shutdown the mobile radio during extended standby times (like overnight), but they don't. So recently, when I've been using my iPad at home on wifi, I've been turning off my cellular radio. To do this, I turn on airplane mode, which will disable everything, then turn on wifi. That's it. Battery life has significantly improved, especially with standby drain. So to clarify, the cellular radio STILL draws noticeable power even when on standby & connected to wifi. Shut it off. Your battery will thank you. I can't believe I didn't figure this out until recently.