I can’t find a topic stating the exact same problem so I’m starting my own.
A few days ago, my FP3 started acting weird : turning off by itself, and refusing to turn back on most of the times I pressed the on button. I suspected a battery problem, since it has been super cold last week and I was outside with it part of the time.
When I use another battery (friend’s battery), it works again. But my battery does not seem broken either, because my battery in his phone works… It is only when it is my battery in my phone that the problems appear.
While testing for battery status, the app we used tells us everything is fine, but the difference between my battery and his battery is that mine has a higher voltage (4200mV) than the standard 3800mV for a FP3 battery.
Also, when charging, the phone would permanently turn on and off, vibrating once every 5 seconds. The problem appears even if I change the charger. It might be a problem with the bottom part with the USB port… then it’s not the battery that is faulty.
Should I just buy a new battery or is there something I’m not getting?
Thanks in advance