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I've used Leaf batteries with the CCar before, so I can speak to my experience with them.

I wouldn't say not to use Leaf batteries at all, but I would say you need to know about some caveats. The cheapest (1st generation) leaf batteries you can find on eBay are often severely degraded, with perhaps 40-60% of their original capacity. In addition, they do not handle overcurrent well, and will swell. You can use 1st generation batteries, but you must make sure you have enough modules in parallel (I would say at least 3, and more like 6 if you want any sort of range) and a proper battery management system to ensure they are treated correctly.

Second generation Leaf batteries would work better--they will have more remaining capacity and should handle things a little better. However, you'll still need to make sure you have enough in parallel (probably also about 3) because they won't be able to handle much overcurrent safely.

That all being said--if I was to build modern batteries for a CCar again, I would get batteries salvaged from a Chevy Volt. I've read they are able to handle high charge/discharge currents, so perfect for a smaller battery for the CCar. They're also not much more expensive than the Leaf batteries, and probably most Volt batteries you buy will have little to no degradation of the capacity. Chevy ensured the Volt batteries would last a long time by programming the Volt to only use about 80% of the actual capacity.

There's one more option I'd recommend if you have the money: Tesla battery modules are pretty expensive, but you could power a CCar with just two of them and have decent range -- or add more for more power / more range.

All of the above will need a BMS (battery management system) -- you can get away without one but you'd be running a risk of prematurely killing your battery pack at best -- and at worst, your battery pack going up in flames, taking the CCar and anything around it with it.

- Jacob