Ninebot Max Error Code 21

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Error 21 on a Ninebot Max.

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

Cause

This error is thrown when the ESC is unable to receive any data from the BMS/Battery.

This may be because the 4 pin BMS data line has come unplugged or is not firmly plugged into the ESC.

It can also happen when the battery is fully dead or something has killed the BMS board inside.

Fix

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