I finally went back to my Motorola Razr this year, after bitching about my smartphone for five years!
I had a Droid RAZR M, two phones ago. I liked it so much I stuck with Motorola since then.
Droid RAZR M -> Droid Turbo -> Moto Z Play
Z Play is a midrange phone, but it has wonderful battery life. The Turbo was reported to have the largest mAh battery of its generation, but its specs ate up a lot of power so as to make the claim fairly irrelevant.