How do I correctly leave my car parked for a long time

an old weak hv battery will likely be completely dead after sitting for an extended period

i live my car up to 8 weals in the middle of winter for the last 6 years. the only thing i do is pump up the tires to max sidewall pressure

it may be time to start putting a maintainer on the 12 volt battery though

one consideration for some people may be rodent control

 

I wouldn't bother disconnecting the HV battery. I would disconnect the 12v for letting it sit a long time. Technically the HV battery is disconnected every time you shut down the car- the main contactor opens.

Property security- do what you need so that people don't steal it (or parts from it)
Wildlife security- are you likely to get mice or snakes or something moving in for shelter?

Consider adding fuel stabilizer so the gasoline in the tank doesn't go stale.
If the car will see a lot of temperature variation, consider leaving the fuel tank full to prevent water condensation. (some models have a bladder style tank and would not have this problem, but I don't know which models)

whatever steps you do take- write them down and leave the list in the car so you can properly un-do everything without forgetting something.

 

No. The car already disconnects it by disengaging a relay inside the battery box. You can't do anything to improve on that.

 

If you define “long time” such as days or years, you will probably get valid replies.

 

Gen 2 sold in North America, 2004 to 2009

 

I second Leadfoot’s advice to disconnect the 12-volt battery as it has sizable parasitic drain due to its searching for the keyfob signal and can easily go dead as a rsult. Also I second adding a fuel stabilizer , and filling tank as full as possible prior to storage to minimize internal water condensation.
Make sure tires are fully inflated to reduce the ovalization or “flat-spotting” of the tire as we used to call it. But in my experience that “thump-thump-thump” will gradually go away if you drive very gently for the first few hours. Expect rust on the brake rotors that can cause an ungodly crunching/screeching sound when you first move and especially when you first apply the brakes. That should go away as the rust is gradually worn away by the brake pads, but braking effectiveness is MUCH REDUCED FOR THE FIRST FEW STOPS!! So please be careful!

 

if you're going to leave your car for three months, same advice as two months