Does your Macan EV keep SoC stable when left idle for a week or longer?

[Wivenhoe]

As this issue wasn’t being experienced until fairly recently I wonder if it as a result of the update (my thought) or the age of the battery. My car is booked in for 3 days mid-month and I hope they sort that and the random age Issue.

I asked why 3 days and they say that it will need that to reinstall/ install software.

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[Dekord]

With my Macan, which was purchased in October 2024, this started after the update I received in May 2025. Before the update, this never happened. The car did not use electricity when stationary and also displayed the consumption while driving accurately. After the update, the problems with the consumption when the car is stationary and the inaccurate display of consumption while driving began. Even after the next update I received in November, the matter was not resolved.

 

[dimaa_6abc]

Hello, very good comments last few pages. Let me reiterate my status - I got one SW upgrade in early May 2025, had a long road trip with mostly rapid charges - no issues. Then the car started what we all report here - not reaching the target SoC during AC charge, losing SoC, etc. During another long trip it was especially messy, once misreporting SoC by 10% according to the charge station, losing 1-1.5% daily, having battery temp higher than the ambient in mild conditions. I had another SW update in October 2025 targeted directly at HV battery and BMS, they reported that they "reset" it, whatever that means. Not directly after that, but soon enough car returned to normal. I'm going to have another long trip, but will try to use AC charge overnight and at the destination, I expect it to return to erratic behavior then.

 

[Fly4ever]

I thought there would be some additional posts on the subject now the ambient temps started to rise...
Since OAT went beyond 17-18° C (same inside my garage) there isn't even the slightest SoC decrease anymore, irrelevantly how much % remaining in my battery and also irrelevantly of My Porsche app usage as well. Additionally the automated and spontaneous battery heating by 5° C above ambient when OAT falls below 15-16 degrees has also stopped.
Most likely the latest software 28.13 introduces an automated feature to slightly warm the battery when ambient temps are lower than 15-16 degrees and obviously because of this the battery looses approximately 1% SoC/day.
Late MY'25 and MY'26 cars already equipped with the latest software 28.13 behave this way right from the start when conditions are met.The older cars MY'24 and early to mid MY'25 equipped with the previous software version didn't behave this way until the time they got the latest software version as well.That explains why there wasn't such a behaviour prior software update for cars exited the factory earlier than August 2025.The newer cars were doing it right from date 1 however it started to be obvious only when ambient temps went considerably lower than 15-16 degrees.
Most likely that's it!

 

[craz8]

For my last test run (after the bms calibration), I ran down to 32% with several daily SOC drops. At that point, the discharge stopped and it held 32% for days. My garage temperatures fluctuate during the day due to windows and sun, but overnight have been consistently the same.

I've just done a trip with 2 fast charges, and 600 miles over 3 days. Later this week I'll be able to leave the car for a few nights to see what happens once some balancing has been done.

After the end of the trip, and a slow charge back to 75%, the car did spend some time overnight at a lot higher temperature than ambient, and when I unlocked the car, it immediately fired up the fans to cool down. I hope that was some extra rebalancing going on that might stop the SOC drop from constant nightly rebalancing.

This trip may have also fixed the residual navigation SOC on arrival mis-match, as it got it exactly right for my home arrival once it recalculated after the last DC charge (It was wrong before that point though, luckily I added a bit extra)

 

[Dekord]

With my Macan, the ambient temperature has no effect on the energy loss. Last year it did this even at temperatures above 20 degrees Celsius. If it happens once and not twice, it's completely random. I've only noticed that it happens more often when the battery is full, and less often when it's less than half empty. It's been doing this for almost a year after the first update. The second update didn't fix the battery drain either.

 

[ron_b]

I received my car (2026 Macan 4) on April 10 after my experience center, Delivery in Los Angeles. I dropped it with a detailer on April 11 before a flight to Washington for one week. When I dropped the vehicle, it was 67%, it had dropped to 66% of the day the detailer did the window tinting and ceramic coat, I assume because he had the car on and the air conditioner ran and he had to move it in and out of his shop. It stayed at 66% until my return seven days later.

I have now had the Porsche dash cam installed and will have to do further testing to see any additional drain that it may cause. But certainly have not seen anything in overnight usage.

 

[Fly4ever]

My calculated by the car SoC on arrival is way more accurate now than before even though it still leans on the pessimistic side.It behaves like it's "expecting" to drive more aggressively than you usual do.But in the same time it seems like the system "learns" to calculate more precisely drive after drive based on my driving habits and is adapting the calculations according to my actual driving.
On a short but difficult to calculate road trip couple of days ago of about 50Km I had 67% on departure and it showed me I'll have 55% on arrival.Even though is just a 50Km distance it was a mixed route of city driving,city and urban road uphill and later downhill and a final stretch of motorway.My actual SoC on arrival was 59%. Such an amount of error I think is quite reasonable given the nature of the route as the car didn't know how I'm actually gonna drive,if I'll use recuperation and how much and how aggressively I'll climb the mountainous curvy road.
If I drove it like a Porsche I would certainly get there with exactly what the car was reporting all along!

 

[tmrqs]

I'll add my $0.02.

I parked my car in the garage on April 5th, with a SoC of 65%. Did not plug it.
I left the country, forgot about the car, did not open the Porsche app.

On April 25th (nearly three weeks later), I was back home and went to the car: it showed 65% charge.
Took it for a spin and drove just shy of 9 miles. When I parked the car, the SoC showed 62%.

Thankfully, everything continues to look normal on my end - and no charge loss so far.

 

[Fly4ever]

1% per week seems quite reasonable!

 

[tmrqs]

1% per week seems quite reasonable!

I think the 3% drop is what I actually used driving these 9 miles. Which would indicate zero loss while not driven.

 

[beez]

I recently left my MY26 Macan 4 for 10 days at 48% with no drop. When I returned the car seemed to have gone into a deep sleep and took awhile for all PCM functions to fully wake. Anyone has insight on that?

 

[tmrqs]

I recently left my MY26 Macan 4 for 10 days at 48% with no drop. When I returned the car seemed to have gone into a deep sleep and took awhile for all PCM functions to fully wake. Anyone has insight on that?

Deep sleep is normal when unused for a while, mine was also off like that.

Issue with the cars that suffer battery drop seems to stem from the car being unable to get into that sleep mode.

 

[ChrisFromUK]

Deep sleep is normal when unused for a while, mine was also off like that.

Issue with the cars that suffer battery drop seems to stem from the car being unable to get into that sleep mode.

Mine has the roughly 1% SoC drop per day problem but the car definitely seems to get into deep sleep when not used for a few days, at least I assume so given how long it takes to start up all the features like Navigation and "Hey Porsche".

Got mine book into the the dealers in late May to be looked at.

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