Why do we even need a 12V battery?

[Doobster6]

Ok, thanks!!…lots of good feedback here! So my concerns are somewhat assuaged, although I did disable the welcome lights, skuttled the Ford Pass from being active when I’m not actually using it, and never carry the fob in my pocket unless I’m planning on driving somewhere, all to stop waking the car up whenever I walk through the garage (which it had been doing, a lot!).
Last question……..In the ‘belts-and-suspenders’ school of thinking, it seems to me that after a couple of years I might want to start carrying a portable jumper/charger box with me….something suitable for an AGM battery, just in case. Can anyone recommend a good one? Thanks all.

Sponsored

 

[JohnFoxeSheets]

Ok, thanks!!…lots of good feedback here! So my concerns are somewhat assuaged, although I did disable the welcome lights, skuttled the Ford Pass from being active when I’m not actually using it, and never carry the fob in my pocket unless I’m planning on driving somewhere, all to stop waking the car up whenever I walk through the garage (which it had been doing, a lot!).
Last question……..In the ‘belts-and-suspenders’ school of thinking, it seems to me that after a couple of years I might want to start carrying a portable jumper/charger box with me….something suitable for an AGM battery, just in case. Can anyone recommend a good one? Thanks all.

The challenge with carrying a portable jump battery is where do you carry it? If you keep it in the car and the 12V battery dies, you can't get into the car to get the battery to jump your battery so you can get into the car. Kinda sucks, doesn't it? I do carry such a battery in my frunk, but it's really to help others that might need a jump...

 

[Shayne]

The answer to this question might best be explained by an EV electrical engineer…..please keep it as simple as possible for us non-EE types!
Since the existing 12V battery is anyway being charged by the HVB through some DC-to-DC converter, why not just take the output from that converter directly to provide the 12V power? Including a separate (and tiny) 12V battery seems like an unnecessary/redundant piece of gear….an additional failure point which has been proven a liability now throughout these forums. It ‘looks’ exactly like the sort of thing a Musk-type thinker would want to eliminate.
So even though my recently leased 2024 Premium 4Xt is essentially brand new (<400 miles), I’m already getting anxious about its 12V battery…….I don’t have ‘range anxiety’, I have 12V anxiety’. I only drive an average of 23 miles/day which doesn’t seem like enough miles for the HVB to keep the 12V battery charged. Then I got to thinking…..

Every computer has a CMOS battery. PC's have a non-rechargeable silver dollar battery that is the spark of life. I agree that the 12V does not need to be used so intensively to boot everything and counted on the way it is (for updates and such). It would be better to have it just wake it up and close the contacts then the HVB takes over. The CMOS battery in computers last for years and so could the 12V in an EV it just does not at this stage.

Sponsored