How much battery do I need?

My truggy (8ight T) weighs just over 10 lbs, with the 6S 4.8Ah pack. That's why I'm considering going back to 5S. The battery packs that have any sort of capacity are really heavy; and I don't think that there is enough of a voltage difference between 5S and 6S that I can actually start using cells that have less capacity.

zpb, what configuration is that A123 pack? Is it a 1P or 2P? I'm just wondering because your high amp draw may be due to the voltage of your pack dropping, if you are running in 1P configuration.

In all honesty, it's all about the cost of the batteries at this point. I've been using the pricier batteries, but I have to admit that the danger of destroying one while clowning around is always in the back of my mind. For just playing around, I'd love to be able to run a 6S 4Ah truerc pack, but from what you're saying, those packs won't be able to keep up.