12V battery reports 255%

<img width="406" height="411" alt="Image" src="https://github.com/user-attachments/assets/b37d8379-395e-4cea-b477-0b6d09248a8d" /> A user sent this in:

I'm curious if that means that 12V battery is always reported as a 0-255 integer -- I'm currently reading it as a percent. Otherwise, this could just be an error state, and I should nullify anything greater than 100