Ninebot ESX Error Code A0
Error "A0" is not actually an error.
This page documents Error A0 for the Ninebot ES1, ES2, ES3, and ES4, as well as the rental models SNSC 1.0, and SNSC 1.1.
For the Max G30/SNSC 2.0+, see Ninebot Max Error Code A0.
If you clicked the wrong error code, go back to the Error Code Index.
Next Error Code: Ninebot ESX Error Code 11
If your scooter displays "A0" and isn't charging anymore it's because your scooter is fully charged.
The "A" is the equivalent of "10" in hexadecimal, so you have 10 0 or 100% charged.
You likely installed firmware on your scooter with "show battery percentage while idle" enabled.
There is nothing you need to do as this isn't an issue.
It just means your scooter is fully charged.
If it bothers you you can flash stock firmware to the BLE and DRV/ESC to remove this functionality.