Here is what I remember.
Yes the original Segway would have needed a software upgrade to accommodate Li-ion batteries.
I did a road trip to most parts of Australia, and did it all, years ago.
When I completed the upgrade, I affixed a flyguy round logo to the rear of the chassis.
So it would be obvious to me, if it ever came back for service.
Does yours have a sticker ?
I guess if you got one green light, then yes your machine has been upgraded.
If you have one green LED and one red LED when charging, there are 2 possibilities.
1
Yes the CSB ( which contains the charger ) may be faulty.
2
One of the batteries or battery connectors is at fault.
Swap batteries, and see if fault stays same or changes sides.
It may be possible ( but expensive ) to have an expert in switch mode supplies fix the CSB without any drawings.
Cheers
Michael
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