pinion size

[_paralyzed_]

Any lipo pack would have to be both submerged and have some kind of mechanical failure before water would hurt it.

Unless you plan on driving in a swimming pool you'll be okay. Even then you'd probably be okay.

Water "can" conduct electricity, but it takes some serious voltage and current to happen.

Keep in mind the gap between the positive and negative blades on a deans connector. Almost all waterproof batteries and speed controls are connected with a deans connector, and there is nothing waterproofing the main power connection. Water doesn't "arc" or close the gap between a deans connector. Water and electronics failures usually take time, and it's oxidation that makes components fail, not exposure.

I've ran non-waterproof speed controls many times in water/snow. I just spray them thoroughly with wd-40 (water displacement-40) afterwards so water cannot sit and oxidize components.