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Tesla Model 3 has a 12V Lead Acid Battery: https://blog.tesbros.com/replace-12-volt-battery-in-tesla/ https://blog.tesbros.com/replace-12-volt-battery-in-tesla/

Tesla Model 3 has a 12V Lead Acid Battery: https://blog.tesbros.com/replace-12-volt-battery-in-tesla/ https://blog.tesbros.com/replace-12-volt-battery-in-tesla/ Nissan Leaf NE1 has a 12V: https://youtu.be/me2_hC5j5gQ https://youtu.be/me2_hC5j5gQ MG ZS EV: https://www.whatcar.com/news/mg-zs-ev-long-term-test-review-report-4/n21602 https://www.whatcar.com/news/mg-zs-ev-long-term-test-review-... BYD e6: https://youtu.be/T-HTF_jiNzY https://youtu.be/T-HTF_jiNzY (at 6:55 you can clearly see a 12V battery) These are all 2nd/3rd generation EVs. Seems more like VW is following an industry standard than anything else.

dathinab 5y ago
Putting in a 12V classical car battery makes a lot of sense. Sadly I don't remember all the details but: - You want a 12V circuit to be able to use "standard car components". - You want to be able to power some components of the car separate from main battery in a way which can be powered from the outside (e.g. by replacing the 12V battery or attaching cables to it). - Just because a batter is well suited to drive a car motor doesn't mean it's also well suited to power a AC, entertainment system etc. Especially it might not be good at only powering such a system (i.e. it might not be good at such outputting some comparatively small load without to much peaks, loss or similar). I'm pretty sure you can find some resources on the internet which explain this is more detail with more technical knowledge :=) But just the fact that it allows you to "have a electric system like every other car" when it's not driving or charging makes it probably worth it for the manufacturer. And I would not be surprised that even if 12V Acid batteries go away EV still would have a secondary battery replacing it.
- baybal2 5y ago
  I worked in consumer electronics, but I can't fathom at all why having two parallel electric systems is though to be simpler than one. A backup battery, maybe, but not a split system. > - Just because a batter is well suited to drive a car motor doesn't mean it's also well suited to power a AC, entertainment system etc. This has no basis whatsoever from electronics engineering standpoint. All these cars have something to provide regulated 12V from main battery already.
  - dathinab 5y ago
    > All these cars have something to provide regulated 12V from main battery already. Yes but as far as I know not while charging and neither while the car is "standing still/parked".

dathinab 5y ago

Putting in a 12V classical car battery makes a lot of sense. Sadly I don't remember all the details but: - You want a 12V circuit to be able to use "standard car components". - You want to be able to power some components of the car separate from main battery in a way which can be powered from the outside (e.g. by replacing the 12V battery or attaching cables to it). - Just because a batter is well suited to drive a car motor doesn't mean it's also well suited to power a AC, entertainment system etc. Especially it might not be good at only powering such a system (i.e. it might not be good at such outputting some comparatively small load without to much peaks, loss or similar). I'm pretty sure you can find some resources on the internet which explain this is more detail with more technical knowledge :=) But just the fact that it allows you to "have a electric system like every other car" when it's not driving or charging makes it probably worth it for the manufacturer. And I would not be surprised that even if 12V Acid batteries go away EV still would have a secondary battery replacing it.

baybal2 5y ago
I worked in consumer electronics, but I can't fathom at all why having two parallel electric systems is though to be simpler than one. A backup battery, maybe, but not a split system. > - Just because a batter is well suited to drive a car motor doesn't mean it's also well suited to power a AC, entertainment system etc. This has no basis whatsoever from electronics engineering standpoint. All these cars have something to provide regulated 12V from main battery already.
- dathinab 5y ago
  > All these cars have something to provide regulated 12V from main battery already. Yes but as far as I know not while charging and neither while the car is "standing still/parked".