[pmc123]

I need to travel for at least 2 months and my car will be parked in an underground garage unused.

Should I disconnect the battery entirely or is there a way to put it into a "no battery draw" mode?

A trickle charger or a solar charger is not an option for me.

[Dan B]

For 2 months, probably not an issue. Wash it, fill the gas tank, and that is about it. If you have a quality car cover that would be nice bonus.

[softtop]

Mine sits all winter while the snow blows (4-5 months). No issues, simply hookup a battery tender, cover it and all will be good when you come back.

[AP]

I think the manual states what to do for storing
Also perhaps over inflate the tyres to mitigate against flat spots.( I think you can buy pads for the wheels I go on if this is going to be a regualr thing , they are curved so the tyre rests evenly in them)

[pmc123]

Originally Posted by softtop

Mine sits all winter while the snow blows (4-5 months). No issues, simply hookup a battery tender, cover it and all will be good when you come back.

A battery tender is not an option for me as there is no accessible power (or sunlight) in this garage.

Should I just disconnect the battery?

[wolvesatthedoor]

Originally Posted by pmc123

A battery tender is not an option for me as there is no accessible power (or sunlight) in this garage.

Should I just disconnect the battery?

It's not gonna hurt anything to do it, but i don't think it would be necessary for that specific amount of time. I would if it was 5/6+ months without moving and i couldn't trickle charge. Idk if you have a plan to have someone move the car if there is an emergency while you're gone, but a disconnected battery would certainly complicate that process if it had to be moved very quickly.

[Dan B]

Originally Posted by pmc123

A battery tender is not an option for me as there is no accessible power (or sunlight) in this garage.

Should I just disconnect the battery?

No need. The parasitic draw will be negligible, so unless your battery is ready to die, you will not have any issues.

[pmc123]

Originally Posted by Dan B

No need. The parasitic draw will be negligible, so unless your battery is ready to die, you will not have any issues.

Do you know what the parked draw is?

A 1-watt draw will take a 105Ah battery down to 50% in 1.5 months.

I may have to measure it to see.

I wonder if it has a low-power mode after sitting for a while. I had an old ducati that would start turning things off like the alarm LED after 72 hours of sitting.

[dan1495]

FWIW I had to let my 23 M440i sit for 6 weeks after surgery recently. I didn’t leave it on a battery tender and it started right up. I don’t think another few weeks would have made any difference

[Dan B]

Originally Posted by pmc123

Do you know what the parked draw is?

A 1-watt draw will take a 105Ah battery down to 50% in 1.5 months.

I may have to measure it to see.

I wonder if it has a low-power mode after sitting for a while. I had an old ducati that would start turning things off like the alarm LED after 72 hours of sitting.

Based on some research an average of about 65 milliamps