Ninebot ESX Error Code 44
"External battery has default S/N, change external battery"
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.
Previous Error Code: Ninebot ESX Error Code 43 - Next Error Code: Ninebot ESX Error Code 45
Cause
This error is caused by the BMS having the default serial number of 4KA0017A1A0001.
This can happen for any number of reasons but usually happens when flashing a firmware file with the serial number included.
Fix
This error is often caused by flashing rental or other firmware to the BMS.
Some have reported receiving this error when the external battery becomes loosened.
Remove the battery, check for corrosion or carbon deposits and then reapply the battery.
To fix the serial issue, change the serial number to a different one by following the guide at Ninebot ESX Change BMS Serial Number.