Try with the charger and cable that cam with the phone, worked for me.

/A

Dammit! I'm having the exact same issue with mine. It's at 20% and declining. It does nothing when I attach the charger (using the MicroUSB-USBC adapter that cam with the phone). I've tried with 3 different cables and chargers. No result. I have factory reset the phone, it's running 20180105-1104 Th...