It's entirely doable. Tesla packs are already close to 400V and it's totally possible to go much higher. Keep in mind that every battery is a resistor so the

It's entirely doable. Tesla packs are already close to 400V and it's totally possible to go much higher. Keep in mind that every battery is a resistor so the voltage across each one is still tiny, even if the overall series voltage is massive. The reason power transmission equipment looks so weird is A) because it handles 345,000V and B) we have a lot of it and the chunky transformers and bare, massively spaced out conductors are way cheaper than wrapping everything in teflon. Also, pretty much all EVs have a 12v lead acid cell somewhere. It's kinda dumb but it's the cheapest solution to having 12v for relevant systems. The pack/charger voltage is stepped down to charge them.