My Nexus 6P is just about toast, well the battery is anyway. For a few months now, my battery has been absolute garbage. On Easter Sunday when at a relative's house I got six hours' worth of battery life. I did a full factory reset on my phone, cleared the cache partition, ran phone with zero apps on it for a handful of days, other than the preinstalled Google apps and didn't achieve anything much better. Now, nearing the end of June I'm at about half that. Three to Three and a half hours max is what I get out of the 6P, and that's barley even touching it. My 20 minute ride to work with Bluetooth not connected, eats up 15%. Normally I'm against running battery apps, but I downloaded AccuBattery and have been using it for about a week and it reports that I'm at 16% battery health, or a whopping 535 mAh.
I've really come to like this phone, and do not have the desire to use any other Android phone that's on the market right now as I'm waiting for Taimen. It's a good thing I only wear cargo pants, because if I am planning to be away from a charging source for more than an hour and I want to take my phone with me, I keep the big Anker power bank that supports USB C in a spare pocket.
I'm guessing this will only get worse. I'm highly considering moving over to the Windows Phone platform with the HP Elite X3 for the next 6 months. But that means I would have to switch carriers since that phone us GSM only, and I use Sprint. Over the next week or two I'm going to weighing my options.