I think I figured out my battery issues and why Voicemail was using so much battery from time to time. I forgot that when you activate a new phone on Verizon they automatically sign you up for 30 days of free Premium Visual Voicemail (VVM), then after the 30 days you can start paying a monthly fee for Premium or revert back to standard VVM. The day my 30 day trial ended Voicemail was killing my battery again and I started getting weird "New Voicemail" notifications but when I tapped to open, nothing happened. And when I opened the Voicemail app there was nothing new. I rebooted my phone and finally the new Voicemail appeared telling me all about the 30 day trial and how to continue, blah, blah, blah. I deleted that message and battery life has been good ever since. I have been seeing similar results to my Turbo 2 on Marshmallow. My phone is off the charger around 16 hours each day and I still have around 30 - 40% remaining when I go to bed and plug it back in to charge. Seems like the Premium VVM may not be Nougat friendly and once that service ended things are good again.