@tbe01025 Thanks, the Arduino sample code.

Tried again.
Insert the BugC battery and turn on power.
On another M5StickC, screen blacked out.

It seems that the problem has been solved by extending the pin socket and removing only the BAT pin.

How about BugC's BAT connected to 5VIN of M5StickC.
But requires 16340 charger.

The LED control method is unknown.

@m5stack
Thanks,
It matches the markings on the battery box.
If I get another M5StickC,I try again.

@m5stack
Thank you.

I found the motor control similar to "BeetleC".
I don't know if it is correct.

M5StickC screen is confused when a battery is inserted into BugC.
Is there any reverse flow from the battery on BugC side to the BAT output of M5StickC?

I have some troubles.

• I2C command have no document (or Arduino sample is required)
• M5StickC and BugC "BAT" pin conflict

If there is a solution, I'm happy.