Surely at 200+ amps for 1 min continuous the little faston terminals would start to melt?

We used to use 4Ah SLAs at 120ish Amps (peak) and after a couple of events the bottom of the batteries had started to sag from the heat they were generating. After a 5 min fight they were too hot to handle.

Im with Ed, I cant believe you are pulling 200+ Amps continuous from such a small battery.