This reminds me of the day I dropped my new HTC One M8 into water. I grabbed it out within a second. The screen was still on and seemed functional, but rather quickly it started behaving erratically. The little motor that handles vibrate was constantly running. The device was getting hot. I couldn't power it off. The battery couldn't be removed. In fact, the entire case was sealed shut so I couldn't even expose the internals to dry them out more quickly. I basically had to sit and watch as it buzzed away and finally died. I swore I would never again buy a phone that couldn't be opened up.
My next phone was the Fairphone 2. I replaced the battery a few times over it's lifetime and upgraded the camera. I bought the Fairphone 3 as soon as it came out (and I'm still using it happily). My wife switched to the FP3 shortly afterwards. We both bought the camera upgrade and spare battery.