If the terminals are poor conductors, Less power flows through them. If that’s the case, the charger doesn’t work as hard, and won’t get as hot. Instead, you’ll feel heat where the blockage (resistance) is, which would be at the poor connector. (Watch out, this can be blister territory). could it be possible that the charger was thermaling appropriately because it was dumping max output into the pack?yeah but not immediately restart like mine does. every single battery disconnected shows 5.7 volts, it was 6.2 about a month ago, but I used a good bit since. Those charger wires are totally rusted, explains why the charger was getting super hot, probably overheating and shut off only to repeat the cycle. similiar to my truck batteries. one cable was loose and it was putting out 18v on one side to get the other side up. Now with that being said, I never did bother to put a multi meter on these scissor lift batteries to see what the onboard charger was doing. They were boiling for sure though, you could hear and smell it. Although that is supposed to be somewhat normal i've heard.
5.7 + 5.7 + 5.7 + 6.2 = (3 really unhappy batteries) = 23.3 volts, which is very low. The charger is probably 30-32v capable under no load to be able to dump all that juice in (of course when connected it won’t show as 30+). If it follows the same set points as others, it will probably turn off around 28 and come back on around 26 or so.