I am having trouble getting my DAMGOO TPA 3116 Bluetooth amplifier board to power up from an Anmbest 6S 25.2V 15A 18650 charger PCB BMS protection board. The battery pack is wired according to instructions with six 18650 rechargeable batteries. I have charged the battery pack. It tests at 19.4 volts with a multimeter. The amplifier board powers up with no problem from a 12 volt power supply, or even a 9 volt battery. When I wire it to the Anmbest 6S 25.2V 15A 18650 charger PCB BMS protection board, it will not power on at all.