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.

[zeropointbug]

I am running 1p pack right now, I switched back from my other 7s2p pack, I kinda like it, not as punchy, but the Revo feels more agile.

Oh, and I made a mistake, my Revo is just under 10 pounds actually, not a little over 9lbs.

Well, the higher the voltage of your pack, the higher the potential amp draw, but it depends, it can draw some amps in the right conditions when voltage drops a lot. My pack usually drops to 19volts from 23v nom., but also, I am finding that the nom. voltage is something more like 3.1 - 3.2v/cell for A123... still experimenting!

[zeropointbug]

Your 8T will probably draw about 80 amps consistant peaks, sometimes hitting maybe 90 amps if you really hit on it hard. You should just get an eagletree now, they are cheap... lol, you have spent a lot of money on this R/C stuff, surely you can afford an eagletree! Caugh! $90 Caugh!

[offroader]

What is the advantages of running a higher voltage 5S pack 18.5V as to a lower voltage 3S pack 11.1V? Will the higher voltage run lets say a 8xl motor faster? Will this motor run hotter at higher or lower voltage? Will your run time be longer on a higher voltage?
Anyone? I'm new at this just figured I'll ask the questions since there's so many options.