Yes, exactly. JB Weld 8265-S original formula.
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I use about 3 long sections of heatshrink per battery, leaving enough at the ends to melt onto itself. Then I use a liberal amount of liquid tape to seal the area the leads come out of. I’m pretty sure I could dunk the packs and be good. Melting heatshrink onto itself is tricky and takes some practice.
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If you watch till the end you see the broken truck though…You can see the truck take massive right swing as it breaks. I doubt the truck broke from its splash into the water. EDIT: It actually did hit that rock first before it took its final swim, so, who knows. 
I thought that onewheel was taking a swim for sure. I LOL’d when it almost went in again too.
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The truck breaks when it hits the rocks on the right side.
The way that it flies out beneath him is to straight. It would have curved or spun if the truck broke.
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Ok, we’re due for a frame-by-frame analysis of truck/wheel angles, completely off-topic LoLz
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My favorite part is when he gets up smiling thinking its all G. 
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Do you have pictures of this battery?
Upon further inspection, there appears to be impact damage.
EDIT: NVM thats the truck. Impact damage here:
I usually just put wet silicone conformal coating on the thing under it, then shrink it while still wet. It seals to whatever is underneath it.
Ok. I’ll get on topic :p.
I think the best way would be to have a battery enclosure that seals on its own, separate from the main enclosure. Think of automotive control unit enclosures. I thought Enertion was going to do this with their enclosures but idk what happened.
EDIT: This is how onewheel does it too, and they’ve been very successful at keeping away water ingress.
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So put the battery in a Tupperware container and epoxy the charge and discharge leads?
No. Not Tupperware… lol
I got some sheet steel I can bend…
I think maybe some type of CNC box with a bead of silicone lid might be best.
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That’s a 3"x7"x16" block of metal to CNC out…
Could be POM too
Ive 3d printed one and covered it in flex seal.
Still working well.
- I conformal coated everything.
- Then used neutral cure silicone to seal off any entry point.
- As an extra measure, I applied hot glue on the outside on the edges of the enclosure.
I have been riding for a little more than 1000km with 10% of the time in rain and I haven’t had any issues. Ideally I want to integrate a humidity sensor with the DieBieMS to tell me if there is water ingress or not, but I haven’t had the need to.
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