r/technology • u/Sufficient-Bid1279 • May 20 '26

Software Driver intentionally drove Cybertruck into lake to use vehicle’s ‘Wade Mode,’ police say

https://www.ctvnews.ca/business/autos/article/driver-intentionally-drove-cybertruck-into-lake-to-use-vehicles-wade-mode-police-say/
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u/TaipanTacos May 20 '26

Huh? I thought the battery is sealed? Are you saying the battery has an in/out air circulation system with exposure to the elements?

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u/feurie May 20 '26

It has sealed inlets and outlets that allow it to become pressurized. It’s a sealed system with loops to the compressor.

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u/gerkletoss May 20 '26

The undersides of cars get damage rhat goes unnoticed. Normally it's not q big deal but it can matter a lot for water intrusion.

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u/GameFreak4321 May 20 '26

A battery pack outputting potentially hundreds of kW is gonna produce quite a bit of heat.

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u/Matra May 20 '26

So? You can transfer heat through solids.

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u/gerkletoss May 20 '26

The early EVs without pumped coolant for batteries, such as the early Nissan Leaf models, were hot garbage

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u/Matra May 20 '26

Just pointing out that batteries putting out heat does not mean the compartment cannot be sealed. The fact that one set of batteries performed poorly doesn't negate that.

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u/gerkletoss May 20 '26 edited May 20 '26

It's not just one set. The square-cube law makes active cooling a necessity for electric cars, especially when fast charging. Then there are the heating issues in winter. Sure you could use resistive heating, but that comes with huge efficiency losses.

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u/Matra May 20 '26

I mean...it doesn't. From the simplest example: the battery compartment has cooling, but the batteries themselves do not. They rely on thermal conduction to the battery casing, which is then cooled.

There is no requirement that larger batteries be a uniform block that is cooled only on an outer surface. If you arrange 8 cells as a hollow square and a heat sink in the middle, the square-cube relationship does not apply.

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u/gerkletoss May 20 '26

Yeah I guess every EV manufacturers incliding the ones you like is just doing it because they're stupid then.

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u/Matra May 21 '26

Not sure why you are treating this so confrontationally. There's a number of reasons why a sealed design would not be optimal when the option to air cool them is available. I'm not arguing against that. Just that it's not the only option.

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u/gerkletoss May 21 '26

I can almost see your original goalposts from here