Hi all,
Just adding my story to the mix. I have the same problem as all of you. My battery on my original Moto Z Droid dies in about 45-60mins with normal internet browsing. Way faster if I'm watching videos. It also dies at random battery percentages, usually above 50%. This problem started after the 7.1.1 update, was subtle at first, but recently has gotten extreme. I basically have a landline now.
When it dies, it won't turn on unless it is plugged in. Sometimes it turns on to its predeath percentage, sometimes higher, mostly to <20%. The newest issue I have is that it is now saying it will charge in 18hrs from 72%. When I went to bed 6 hours ago, it was at 68% and said it would be fully charged in 2hrs. I haven't tried resetting it since this issue, but I will report back if doing so changes anything.
I'm glad to see that nothing I can do will fix the problem. I already suspected this since I've tried everything short of a factory reset. I've almost tried it on several occasions, but I was hesitant because I didn't know if it would work and having to restart everything would not have been worth the hassle.
I will say that since this new issue of "18 hours to full charge" from 72%, the battery settings have started showing other app use. Before, it was just reporting 1-2% for the screen, Android system, and phone idle.
I'm going to try a restart now to see if the battery will "charge" faster.
You can also see in the screenshot a time where I had sustained 100% battery. During this time, my phone was unplugged but still said it was charging. I desperately needed my phone and was away from a turbo charger, so I didn't do anything to change that until I was safe to do so. Restarting it fixed that, but now it won't charge at all.