Itís a legitimate question. We get flash floods here. Often times when already out driving. I know not to drive through deep water. I want to know if the batteries will be effected. I need to understand that the purchase that I want to make is the right one for my family.
My man, no disrespect, but it's not a legitimate question. There is nowhere you need to be so bad that it justifies driving thorugh flood water. Nowhere. Go around. Go somewhere else. Don't drive thorugh flood water. The right choice for your family is to not drive into flood water. That is independent of whatever vehicle you choose.
In general, the batteries and drivetrain components of any vehicle are incredibly robust and waterproofed (resistant) against splashing, puddles, etc. This includes electric vehicles of all kinds. Lithium batteries and water are mortal enemies. The battery should be sealed from water intrusion, but seeing what the reaction of lithium and water looks like, I wouldn't put myself in the position of becoming stalled in water with submerged batteries.
I've been handling insurance claims for 15 years now. I'm incredibly risk averse. Your personal tolerance for washed out roads, cars floating away, people drowning, submerged lithium batteries exploding, or drowning and burning at the same time may be much higher than mine.
I've seen the pictures. I've talked to the families. I listened to a mother cry for nearly 45 minutes after telling me about when she unbuckled the lifeless body of her daughter from the car seat. She really thought it wasn't that deep and she could make it through. She was so close to home, and her daughter was tired.
If you can't see the bottom, you don't know how deep it is.