How big battery charger do you have? It should not blow the fuses.
I charge this very way using a trickle charged that pushes up to 2 A and it works flawlessly.
I also had a frunk issue, but due to dead battery a while ago. I dove under the front of the car and I finally located the cable. One pull and it was open. Simple.
Since then I charge via cigarette.
As for idling? Why? What for?
Do not. I would rather let the battery go flat than idle the car for 30 minutes.
Take it for a spin. Salt? Germans made the car solid.
Are you going to donate the car to the museum? Is it a collectible/display model? No, it is a car and it should be driven.
I cannot drive in winter due to summer tires, yet I still took it for a spin on snow. Just for the fun of it.
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Current rides: 2003 Porsche Boxster MT (me), 2019 Bolt LT (me), 2015 Audi Q5 (wife), 2008 VW Rabbit (2.5 inline 5, MT, well, for kid... but you now, it is the 5 straight)
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