True RC Batteries

[Finnster]

Well, power during driving is so peaky that its hard to say what is const. It would pull upto 120A for 1-2s, but would quickly drop off to ~30-40A at full speed. If you pulled 120A non-stop you would drain the batts fast.
Here's one example of what I mean. Its just a long spd run so things are easy to see. Peak here ~110A and voltage says above 14V (better than 3.5V/cell @ 14C) This is a 4S2P "10C" 8K pack. IDK how far you can push the 5K cells, I've been curious myself, but should be ~= to the 4k cells in capability I think. They seem like same formulation just slightly bigger. I would bet 15C would be a fair rating.
4S 8K pack

5S2P A123 pack