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 Segway Ninebot ESX(ES1, ES2, ES3, or ES4) or Segway 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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