Cybertruck battery is 4 x 200V units in series. Switch inside allows switching between parallel and series to optimally charge at 400V and 800V

[Petertsai]

Sw

The Cybertruck battery is 4 x 200V units in series. A switch inside allows switching between parallel and series to optimally charge at 400V and 800V

Source: 31 minutes into this video

switching high power DC 800 and 400 volts is not trivial due possible dc arcing and can weld contacts or cause fire.

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[scottyah]

Huh - I didn't create the problem.

Telsa is creating the problem then selling the solution. I believe they're referring to a practice like Apple laptops switching to USB-C ports only, then selling all the dongles required for people's accessories to work with their new computer.