One thing I don't like about a parallel setup with deans is that if you get a bad (dirty) connection at one of the two connetions you won't know it. In other words, you could feed off one pack without relizing it until it is too late and your pack has overheated. One pack will be red hot and the other will be stone cold. I have had this happen to me more than several times. I usually run my cars in a somewhat dusty enviroment. Mabe, that is why I'm having this problem.

If you are running a serial setup. This can't happen. If you get a dirty connections the circut doesn't complete and you go no where.

One solution for parallel would be better battery connectors. I've thought about using 6.5mm bullet connectors. That might work better.