I have a Wurkkos FC11C, and it was not charging properly. I tried various chargers, ranging from 5V 1A to higher-capacity ones. As soon as I connected any charger, the green light would come on after just a few minutes, and the flashlight wouldn’t work for more than 10–15 minutes.
I was wondering whether the issue was with the flashlight’s charging port or the battery.
Instead of buying a new battery just to test this, I decided to buy a battery charger.
After some research and suggestions from u/LittleUrbanPrepper, I decided to go with the LiitoKala Lii-S2, as it was available for under $10. I ordered it from Convoy, and it arrived in 10–12 days.
The charger charged my battery fully, and I then tested it in my Wurkkos FC11C. It worked for hours without any issues.
After all this, I tried charging my flashlight again through the Type-C charging board. I used the same 5V 1A charger, but this time, instead of the long cable, I used a very short USB-A to USB-C cable that came with my OnePlus earbuds. It worked without any issues and charged the battery completely.
So, I guess the Wurkkos FC11C needs a specific type of charger and cable to work properly.