Ok that's helpful, and as the higher end stuff are far to expensive for me, I'm probably going to go with the 4000mah turnigy battery's which are said to be 90c, but then says later in the discription that the continuous is only 45c with a peak of 90c, but it still should be fine.

And as cheap Chinese Internet company's go, turnigy seems to be pretty good, and have an ok name for them selves, so I'm hoping the lipos should be fine.

I will probably fit a fuse which is similar to the continues current, around 180 amps as I don't think it should blow from peak current but will after prolonged use

Is the aluminium base plate still recommended? Or can I just use the material from a lipo sack to line the lipo box in the robot to reduce the danger from a lipo fire, As the plastic would melt intstantly so you'd end up with a hot molten mess which I suspect most EO's don't want burnt to the bottom of there arenas