Battery status

I try to use the battery status and followed the instruction… 1 line… added #define USERMOD_BATTERY_STATUS_BASIC in the my_config.h in the wled00 folder than it should work or am i wrong… i tryed several thing but noting work… what happens when i put in the line and build and flash , after flashing the board resets as expect but never start up or turn on… only thing i see is 1 led on my strip is bleu…

can sombody piont me the right direction.