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Ford apprentice tech here, when we do module programming for the mustang mach e, most customers do not know that the 12v battery is only rated for 450cca and is charged by the high voltage battery while the user uses the car. In order to do programming, we are advised to put the 12v battery on a trickle charger (15amps -30amps) in order to prevent excessive battery drain. Also when the article mentions the mach e owner's ford app showing 94% charge, that only shows the health of the hv battery and not the 12v battery (as far as I'm aware). Conventional ford ice and hybrid cars have bigger 12v batteries 760cca or more. Ford i believe doesnt offer bigger 12v battery due to the design of the battery tray, so owners would have to go aftermarket battery tray and tie down if they wish to put a larger capacity 12v battery. Hope this helps ev owners understand their cars better.