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M3 SR+ Long-term Airport Parking

Hi everyone,

Thinking about getting an M3 SR+ but I often have to travel for work for 3-4 weeks at a time. I’ve no access to a home charger so will need to leave the car unplugged. If I leave it with 90% charge, is there any chance I’ll find it with some charge left when I come back after 4 weeks?

Alternatively, are there any long-term airport parking options in London where I could access a charging point in case the battery is depleted on my return?

Thanks!
 
Haven't left my M3 LR for more than 10 days but during that time it dropped by something like 1%/day if i remember correctly, maybe less. You'll be fine if you start at 90%.

Just remember to turn off sentry mode so the car can go to sleep. With sentry mode on you'd be looking at more like 5%/day (i think it turns itself off when battery drops to 20% though?).
 
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Haven't left my M3 LR for more than 10 days but during that time it dropped by something like 1%/day if i remember correctly, maybe less. You'll be fine if you start at 90%.

Just remember to turn off sentry mode so the car can go to sleep. With sentry mode on you'd be looking at more like 5%/day (i think it turns itself off when battery drops to 20% though?).

That’s great to know, thanks! Sounds like it’s doable.
 

MrT3

Active Member
Jun 26, 2021
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1,325
UK
It will depend slightly on the time of year but this test suggests you will come back to around 75% after 4 weeks.

 
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Rooster6655

Active Member
May 3, 2019
2,052
831
UK
Hi everyone,

Thinking about getting an M3 SR+ but I often have to travel for work for 3-4 weeks at a time. I’ve no access to a home charger so will need to leave the car unplugged. If I leave it with 90% charge, is there any chance I’ll find it with some charge left when I come back after 4 weeks?

Alternatively, are there any long-term airport parking options in London where I could access a charging point in case the battery is depleted on my return?

Thanks!

I left the car for about 4 weeks and it used about 1-1.5% (4-6m) a day on a LR but this was over a year ago so they may have improved efficiency since then.
 

M3noob

Active Member
Supporting Member
Aug 22, 2019
1,010
789
Beyond the pale
I left the car for about 4 weeks and it used about 1-1.5% (4-6m) a day on a LR but this was over a year ago so they may have improved efficiency since then.
I just left my LR locked in my garage for two weeks, sentry off. Went from 80pc down to 52...and no I didn't wake it up daily. But it did update. I'll be keeping an eye on that.
 

M3noob

Active Member
Supporting Member
Aug 22, 2019
1,010
789
Beyond the pale
Also car was powered down and wifi off
I left the WiFi on... always eager to get the latest bug fix (and vain hope for a scintillating new feature or FSD update). 2kw a day seems a bit thirsty nonetheless.

Given the proximity of the router and the car's antenna, it really shouldn't have been a major power suck.

I take your point that if going away for more than a fortnight, powering down is the way to go.
 

MrT3

Active Member
Jun 26, 2021
1,933
1,325
UK
I left the WiFi on... always eager to get the latest bug fix (and vain hope for a scintillating new feature or FSD update). 2kw a day seems a bit thirsty nonetheless.
WiFi won't make a difference, that is low power, and if it was disabled then it would use 4G to do its communications to the mothership.

My car hasn't been used for over three days, during that time it seems to wake up twice a day, normally for around 30 mins each time. During that time it attaches to my WiFi, then as it goes to sleep it disconnects so WiFi isn't always on anyway.

During those 3 days the charge level hasn't dropped, only today did it drop 1% after I had the doors open for 45 mins whilst I cleaned the interior, so your consumption certainly seems excessive.
 
With Sentry and Overheat Protection off my car SR+ loses almost nothing overnight so long as I resist the temptation to not regularly open the App.

It is fairly easy to set preheat for departure by mistake (did it myself once) so if anyone is experiencing excessive Phantom Drain it's something worth checking.
 

Adopado

Well-Known Member
Aug 19, 2019
6,830
5,452
Scotland
I seem to lose about 1 to 1.5% per day when I’m on holidays.
I wish airport parks had something, even low power chargers, to keep the battery topped up…

Have you noticed any change to that in recent times? It may just be ambient temperature influences but I seem to have less drain than used to be the case. If I've charged the car and haven't needed to use it for a couple of days I've often seen no loss of percentage at all. (It's a long time since the car has been left for a whole week so I can't actually compare that scenario.)
 
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Guys, good to read the post on airport long term car park for our lovely m3. I have brand new m3p. I live 60 miles away from Heathrow and might have to travel at short notice. Taxi charges £70 to Heathrow and £70 for return. Heathrow Long term t3 car park is £80 for 2 weeks. What should be the best and stress free option? I don’t want to worry about my m3s safety whilst I am away
 

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