So we have 2 things going on. The standoff was a real problem but in fact our ‘root cause’ here is that your battery was not charging at all due to the charger set incorrectly. The standoff just complicated the issue.
I am going to put a strong note to have users check their charger primary voltage setting and add a picture in more than one place because this happens every once in a while.
This is another step our factory is supposed to take care of but it would be a good idea for us to put more steps in place for users. I think there is a sheet in the robot that talks about this but I know how it is, people get excited and a great many people do not read things.
I feel we need a red sticker on the power supply itself that is obvious that tells users to verify the primary power setting before usage.
I strongly suggest you let your battery get a very long charge at this time. The battery is fully charged when the charger fan stops and the LED2 remains green.
To see how badly the battery was degraded let it remain on the charger while you mess with the robot today (so maybe put the robot up on wood blocks so wheels don’t touch floor) then you an play with it and watch wheels move and so on.
After a long charge with charger plugged in the total battery voltage will be above 27V so then if you disconnect the charger a healthy set of 2 batteries will sit around 25volts or more for total voltage for hours if the Magni is off. If voltage drops right after charger disconnect below 24V that indicates the batteries are not very healthy.
Also I think it would be safe to shutdown the robot then remove red battery cable and put back in the 50 pin sonar cable then plug back on battery red cable. You can check out the sonars and other parts of the robot on this page: https://learn.ubiquityrobotics.com/verification