want to warn you that the wires of the battery holder mapped incorrectly to the board. The black wire is connected to “-” of the battery and “+” of the board connector. The red wire is connected to “+” of the battery and “-” of the board connector.
Another problem is that there are no mapping labels on the battery.
Unfortunately, I realised this after connected the battery to the board and the battery started to burn. Now the BAT LED is always on, not sure if it is not damaged. I am absolutely new to the electronics, is it safe to continue use it like this?