After letting my Galaxy S6 drain more than usual, I connected it to the fast charger a bit after it hit 1%, and left it for the night while still powered on.
Next morning the phone was off. Powering it on, the phone shuts down before completing boot.
I plugged it in to an Anker charger, also supporting Quick Charging, and left it all day. Same problem. Once it managed to finish booting, allowing me to catch a glimpse of the 0% battery indicator in the status bar.
I tried booting into recovery mode (holding Vol. Up and Home while pressing Power) and left it to charge for about an hour before rebooting. Same problem.
Any suggestions, please? :-)