this post was submitted on 24 Jun 2024
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There really shouldn't need to be a 12V battery at all. Stepping the voltage down isn't that complicated, but the supply chain for the necessary parts aren't there for the car industry.
Plus, it'd be really nice if everything could run off a 48V line instead of 12V. The wires can be thinner due to less current draw. Getting that to work across all the electronics for everything is a whole separate level, though.
You don't want to fully drain the main battery as it would do severe damage to it and most of the 12v system has a phantom draw of power so to keep the main battery from running out they have a separate one
Compared to what the main batt can provide, there's barely any draw from the other electronics.
That's not the point the fact is that there is some dumbass that probably will let it sit at 0% and kill the battery
Battery management electronics don't let you drain lithium batteries to 0%. It's a severe design flaw if it does.
You still end up with the same problem of no power for locks when it turns off the battery
I think it's mainly there just to be able to control the circuit that cuts power to the high voltage battery off while the car is parked for safety reasons.