@m5stack

Thank you. I will try it when it arrives.

Bought M5Stack Gray. Works fine.
Wanted more battery so bought Battery 700ma module. Works fine.

Wanted Grove B & C ports so bought Base26. Kind of big...
Ordered Module Plus which has Grove B & C and a 500ma battery.

Do I need to remove Module Battery 700ma to use the Module Plus?
Should I remove the 500ma battery and use both Module Battery 700ma + Module Plus (with 500ma removed)?

Cheers,
Ric

Its common to wire a LED to a GPIO (pin) as Active "Low".

One pin of the LED gets wired to +V and the other pin goes to the GPIO.
At some point there is most likely a resister to limit the current.

Apparently its easier (less heat?) for the GPIO (pin) to source power by pulling the circut "low".