How many ah?

[What's_nitro?]

I thought I should point out that to match the performance of an ICE with an electric motor you don't need to match the HP. So assuming the snowmobile you want to convert had a 125HP ICE in it, if you put a 95KW electric motor in there I think stuff is gonna break.

I'm guessing here, but 50-70KW should be more than adequate to match the performance of the original engine. You'll also get a lot more runtime.