[defrost]

> I always plug in the charger if the car's going to be parked for more than a couple weeks.

To this day, since ~1980, I disconnect the +ve battery lead if the cars not going to be used for a few days or parked up in the bush waiting for when we get back from a walk.

Stops parasitic drains and Heisenbug discharges when thermal expansion during a very hot day causes a hard to track short.

[ericbarrett]

My 2019 vehicle's manual explicitly says not to do this, and that if the battery fully discharges you should make a follow-up service appointment to frobnicate the computers. I miss older cars.

[mulmen]

I have heard that sudden voltage spikes can set off airbags.