I think they explained it to me like this, kinda like installing a halogen headlight bulb without using rubber gloves to keep oils off your fingers off the bulb, handling a circuit board for a refrigerator without being properly grounded. You have just killed it not knowing when it will actually "Croak". I have already replaced mine with the wire plus, but if I had to, had to, could not roll it off at all, stuck in a valley both sides up,I might jump it off with just the battery, with the other vechicle "NOT" running for sure. I have already found they don't push well at all. That would be the only way I would even think of jumping my scooter off, I would try rolling it off if at all possible.
Down big hill,
Charge it up with a Battery Tender slowly over night,
Ray