I am wondering how Aptera will manage the 12V subsystem.
The lead-acid is heavy and is not reliable.
During the pandemic, I had to jump-start my Citroen C-zero (aka I-Miev) when I wanted to use it again.
On my Ioniq, no problem as the car is monitoring the lead-acid battery voltage and will recharge it from the traction battery if needed, and will tell you that when you start the car the next time.
If the Aptera use a lead-acid battery, I hope that it will do like the Ioniq.
A better option would be a 12V LFP battery or even better a DC/DC converter and remove the accessory battery to save weight and increase reliability.
Of course the DC/DC will use a little bit of energy, and anyway there will be one to charge the 12V battery from the traction battery. For efficiency while the car sleeps, a second low power DC/DC converter would be nice, and a special place we can open from the outside. There, a key could be use to switch off the DC/DC converter to put the car in storage mode if needed. When in storage mode, we could then also plug some jump-start cable if needed (like if the car traction battery is at 0%, and then won't allow a charge as the car could not communicate anymore with the charger).
Exactly*: The sweet spot that's been working great for me so far is the way smaller gel motorcycle battery shown hand-held in blue above. It only needs to power the door locks, then run the alarm system (until I unlock it), then activate the traction battery's contactors. That connects the DC-DC converter which starts & runs everything else in the 12V system.
* It doesn't seem to catch surge loads. I downsized mine by 95% from 60Ah to only 3Ah & there were no issues at all. There's likely plenty of surge capacity in the 24kWh traction battery. Also, the DC-DC converter has to be able to handle blasting everything, or else the 12V will go dead if you do that. You could probably downsize the converter to handle everything except very momentary loads like windows & locks, & even a tiny 12V like mine should handle such short loads.