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I think H2S is somewhat bigger of a safety risk than presented here.

For example, check out this case where what you describe (battery rupture) happened, killing both occupants from H2S inhalation:

https://web.archive.org/web/20161005164308/http://www.wesh.c...

And this was only from a starter battery, not a battery sized for vehicle locomotion.

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It's interesting that Porsche put the battery under the driver's seat (in the cabin? unclear). Wonder if that made it more dangerous. Are modern EV batteries also in the passenger area or in their own little armored section...?

It was probably put there for weight distribution as Porsche would be more likely to optimize for that despite the user inconvenience it may cause

Possibly for a Carrera, but for a Cayenne? Despite the Porsche brand, that isn’t anywhere close to a sports car. The platform is shared with the Audi Q7 and the VW Touareg. It’s a tractor with nicer seats. The weight of a battery fitting under a driver seat would be similar to a big shopping run, so weight distribution wouldn’t have been a consideration.

Manufacturing logistics probably played a bigger role.

My Land Rover Defender had the battery under the seat as well.

But hey, there are so many holes in the car it’s basically permanently venting…

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