M5StickC + 18650C (HAT external battery) BAT pin
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 Does anyone know where the BAT pin on the HAT connector goes? I see what I think is the internal battery voltage on it. So when I use the 18650C accessory the 18650 is connected in parallel with the internal battery? Is that correct? Thanks! 
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 @liamharrison3 yes. the 18650 is connected in parallel with the M5StickC internal battery. 
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 @m5stack This means that when the Stick is plug to the 18650C accessory, the 18650C accessory will not charge the internal battery? 

