Tony Posted March 10, 2017 Report Share Posted March 10, 2017 Would connecting to the wrong terminals cause this ( reversed polarity ) Quote Link to comment Share on other sites More sharing options...
Geoffers Posted March 10, 2017 Report Share Posted March 10, 2017 Yes it would but it's unlikely because as soon as it touches this the wrong way round the spark and crack is quite frightening. I mean really bad as anyone who's done it would testify! It's hard to get past that and connect up as something clearly isn't right. That doesn't mean it didn't happen though so very possible. More likely the battery has had a plate buckled or something (maybe why it needed a jump start in the first place) and the output current from the good one has put so much charge into it it's caused it to heat up rapidly and it's gone on fire and then ignition stuff around it, then the runaway effect and you end up with this. Or it, possible they left one charging the other. You know how hot and smelly a battery can get just on a 8-10amp home charger - imagine 60amps being pumped into it for even a short time. 1 Quote Link to comment Share on other sites More sharing options...
Viking Posted March 10, 2017 Report Share Posted March 10, 2017 Looking at the other pics which aren't shown here, the car is a Mk3 VW Jetta, and the battery has the negative or ground terminal nearest the front of the car, and the red jump lead is connected to this terminal. 1 Quote Link to comment Share on other sites More sharing options...
Tony Posted March 11, 2017 Author Report Share Posted March 11, 2017 Odd the charge leads and battery look almost in tacked so i wonder where the fire started.... I have seen a battery explode and boy do they go but no fire though. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 17, 2017 Report Share Posted March 17, 2017 I've seen how quickly heat can transfer from a battery to a misplaced ratchet - it was scary ! Glowing red then starting to go white, could have been a mess like the above. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 18, 2017 Author Report Share Posted March 18, 2017 Really that fast ... Still you would think the leads would melt first? Quote Link to comment Share on other sites More sharing options...
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