ORIGINAL: Trek1771
If they do not have the stock HPI part and you dont want to order it and wait, I would see if they have the Traxxas ESC used on the Stampede VXL. The Traxxas is Waterproof. The only issue would be that you would have to have the connectors on the Traxxas ESC switched to Deans plugs or have the connectors on the car and your batteries switched to Traxxas plugs. I would switch the car and the batteries to traxxas plugs, because it opens up the availablity of alot more options in batteries. I switched My HPI ESC to a Traxxas battery plug and it is great!
I would stay away from the traxxas ESC not very tuneable and i've heard tooo many stories of people blowing them...
I would go for a castle sidewinder V2 or the MMP, the V2 is what you currently have...
Did you call HPI about this issue they may replace it under warrenty they're pretty good about that...
the lug