thought I would comment on 12v battery State of Charge loss after hearing from EV owners like tesla, leaf, and others about the 12v battery when left for long periods of time. I gather it's worse with the new vw id3.
So, I was wondering why vw doesn't have a gauge or have the info listed in the infotainment system? ICE cars have (had?) them, why get rid of that parameter/gauge, especially when it's so critical to the cars function?
Anyway, I'm sure you've seen them, but there is a handy little device that connects to the poles of your battery, and via bluetooth to an app on your phone (see the video below or search online for battery monitor. Amazon has some for around $30-$50 CAD). Gives you a consumption timeline graph if you're interested in charge loss over a 24hr period. Very handy. Very interesting.
I was able to see that my 2017 loss when parked, and not plugged in, over a 4 day period was quite a bit more than I thought. Not sure if weather temp was a factor, but it was cold. The 12v battery went from 98% to 69% SOC over those four days, where the main pack didn't seem to change. I can now understand if someone was parked for more than a week at an airport or something that they might have issues "starting" or even getting access to the vehicle.
I found a youtube video with someone with an id3 using one of these devices, and how they were monitoring its SOC.
Just thought I'd pass this along, as I found it very informative and helpful.
https://www.youtube.com/watch?v=jUgOozT ... ex=31&t=2s