Ninebot ESX Error Code 21

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Error 21 on a Ninebot ESX.

"Battery Communication Error, Please check the Battery, Control Board & related connections"

Cause

Often error 21 is caused by a disconnected BMS cable.

Regardless, this error indicates that the ESC/DRV is not able to communicate with the BMS.

This can happen if the BMS/battery is dead or if the cable has come unplugged.

Fix

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