Ninebot ESX Error Code 20

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Error 20 on a Ninebot ESX.
"External battery voltage is abnormal, check battery, control card, cable connected."

If your Ninebot ESX(ES1, ES2, ES3, or ES4) or SNSC (1.0 or 1.1) is beeping or has a red wrench icon and flashes this code, read below.

If you clicked the wrong error code, go back to the Error Code Index.

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