mamba max on emaxx with 2 6s lipo packs (( HELP))

[mwe-maxxowner]

Lol, he pretty much wants it as big and heavy as he can get it(it's not my truck, we just keep posting under the same name-he's too lazy to make his own, and I made the mistake of staying signed in on his pc by accident).

If we ever order more packs, would 2 3s 5000 30c be a better choice?

Just one of these packs can't give enough amperage alone, can it? Can someone explain to me how to calculate this, so I can use it in the future? I have a mamba 5700 on a stampede and an hv-maxx, and it'd be nice to be able to calculate the amps of lipos for those, instead of having to ask so many questions to see if a pack is okay.

We don't do any racing. We've hit the track about twice, but it certainly wasn't competitive, so the added weight shouldn't really matter. Until he crashes lol.