https://gitlab.denx.de/u-boot/u-boot/blob/master/drivers/power/axp209.c pmic_bus_write(AXP209_SHUTDOWN, AXP209_POWEROFF);

Should be replaced by

pmic_bus_setbits(AXP209_SHUTDOWN, AXP209_POWEROFF);

Because currently uboot write 1000 0000 in REG32 instead of just writing 1 in bit 7. Overwriting over settings such as battery detection enable.