I have seen a 3-4 year old diesel truck with original batteries that had one of the two batteries fail in such a way that the truck wouldn't take a jump start. We could remove the one bad battery and connect the jumper cables directly to the cables that were attached to the failed battery and it would then be able to be jump started. We didn't drive the vehicle this way at all. We only did it to verify if the truck would indeed start.
Honda HRX217VKA (k4), Echo SRM-230 trimmer and Echo PE-230 edger
Case 448, 2 Gravely walkbehinds