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

[ChrisFromUK]

My car was built in March 2025 and delivered April 2025 and has always had the 1% / day SoC loss. This has continued after the 28.13 update although since the update the SoC is more erratic but over a few days will always return to the 1%/day loss trend. I'm not sure I see the battery warming. Car lives outside and the battery temp seems to be approximately the average of day and night temps.

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[Fly4ever]

My car was built in March 2025 and delivered April 2025 and has always had the 1% / day SoC loss. This has continued after the 28.13 update although since the update the SoC is more erratic but over a few days will always return to the 1%/day loss trend. I'm not sure I see the battery warming. Car lives outside and the battery temp seems to be approximately the average of day and night temps.

Now I'm getting a bit confused...!! I was hopping I might have found a plausible explanation what is going on here...!!!

 

[Dekord]

As I described a while ago, my Macan is behaving abnormally. It loses about 1% of its energy per day once, and then the battery temperature is 3 to 4 degrees higher than the surrounding area. When it is not losing energy, the battery temperature is the same as the surrounding area. The car is a 2024 model and it did not do this for the first 6 months until the first update. The energy loss occurs in summer and winter, regardless of the outside temperature. However, it does not always lose energy. This occurs completely randomly. It mostly loses it. There are also sudden drops in charge while driving, when the battery is below 60% charge. In reality, the battery is not as discharged as the car shows, because when charging, not as many kW are going into the battery as it should. My wife also has a BMW iX1, which does not experience such anomalies and you can rely on it. I can't rely on my Macan, because I never know how it will behave and it is completely unpredictable. The battery behavior is not normal and you can even stop on the road due to a rapid false drop in charge while driving. This bothers me more than the daily 1% energy loss. Calibration helps, but not for long. After two to three charges, the issue repeats.

 

[byebye]

As I described a while ago, my Macan is behaving abnormally. It loses about 1% of its energy per day once, and then the battery temperature is 3 to 4 degrees higher than the surrounding area. When it is not losing energy, the battery temperature is the same as the surrounding area. The car is a 2024 model and it did not do this for the first 6 months until the first update. The energy loss occurs in summer and winter, regardless of the outside temperature. However, it does not always lose energy. This occurs completely randomly. It mostly loses it. There are also sudden drops in charge while driving, when the battery is below 60% charge. In reality, the battery is not as discharged as the car shows, because when charging, not as many kW are going into the battery as it should. My wife also has a BMW iX1, which does not experience such anomalies and you can rely on it. I can't rely on my Macan, because I never know how it will behave and it is completely unpredictable. The battery behavior is not normal and you can even stop on the road due to a rapid false drop in charge while driving. This bothers me more than the daily 1% energy loss. Calibration helps, but not for long. After two to three charges, the issue repeats.

My September 24 Turbo has got the exact same behavior regarding the BMS and the SoC.
My car is mostly parked in an underground parking at 17/18 C , and the 1% loss appeared after some modules updates on september/october 25 (they were intended to solve my red circle of death problems) and the BMS erroneous behavior with sudden apparent discharges appeared juste after the 28.13 update, around January 26 in my case (Which was, with other fixes, intended to fix my red circle of death).

So I think the @Fly4ever 's reasoning is very aligned with my reality check...

(btw, my Turbo has a big issue related to partial or total loss of power / red circles of death that are definitely not connected to any of the updates, and that Porsche is unable to fix. Can't wait to replace this dangerous car with something else...)

 

[dimaa_6abc]

Left our Macan at 59% for 2 weeks. We are back and it is at 59%. Before, it had a mix of what is reported here, the worst is 1-1.5% SoC drain per day with battery temperature a few degrees higher than the ambient. Guys, do you start getting the issue after a long trip with a few rapid charges in quick succession, or just while driving neat home and slow charging? It seems once the problem is there, it won't go away no matter what you or dealer does. But it my case after another SW update and without rapid charging it went away.

 

[byebye]

Since January 26, no fast charge, only 4,7 kWh slow charge

 

[dimaa_6abc]

Since January 26, no fast charge, only 4,7 kWh slow charge

It might have been enough to have a trip in January. Mine was glitching a long time once this started.

 

[ChrisFromUK]

Since my 4 was delivered in April 2025 it has been losing 1% / day of SoC very consistently.

It finally went into the dealer to be looked at in May (2026) where they installed 6 software module updates including one to the BMS. I think these updates pre-date the slightly more recent SQ4 & SQ5 updates but who knows.

These updates appear to have completely fixed the problem. In fact I just got back to the car after a 6 day holiday with it left unplugged at 62% SoC and it was reporting 61% when I got in and it stayed at 61% until I had driven a few miles and then started dropping at the expected rate.

So, for me at least, the recent software updates seem to be a solution.

 

[Wivenhoe]

Those 6 updates resolved my range displaying issue. Before it, sometimes the % at the destination was more than on start up. It seems like the actual range has improved but that is probably more to do with the weather

 

[platypus]

These updates appear to have completely fixed the problem.

Music to my ears Meanwhile mine is still consistently losing 1% per day in my garage, while I’m away. I’m a few months behind on software updates though, so excited to hear.

 

[byebye]

At least! more than one year to solve a problem that is well documented... and that was denied by some dealers (no no, normal behavior...) with the help of Porsche.
I'm not sure that I will see the fix on my Macan, but hopefully it will fix yours.

why there is no explicit mention of this apparently fixed issue in the release notes?
what is the impact on the health of our HV batteries for being 24/7 a year under constant discharge because of this 1% every day loss?

Porsche certainly knows, but they've decided to not elaborate on that: a problem that doesn't exist in the first place doesn't need to be fixed, that's obvious.

 

[krissrock]

i really think ppl should stop checking the battery everyday....do it once per week instead...or two weeks...if you must.
It should be understood that you basically "starting" the car every time you open that app, as it has to poll alllllll the systems that the app reports on.

others have said, "that shouldn't be enough to cause 1% drain" ...but the question still remains as to why you need to monitor the battery level Daily

 

[ChrisFromUK]

i really think ppl should stop checking the battery everyday....do it once per week instead...or two weeks...if you must.
It should be understood that you basically "starting" the car every time you open that app, as it has to poll alllllll the systems that the app reports on.

others have said, "that shouldn't be enough to cause 1% drain" ...but the question still remains as to why you need to monitor the battery level Daily

I don;t think it is polling the car when you check in the app. I've been checking my car relatively regularly and the apps battery page clearly shows how long it has been since it had an update from the car. Just recently, that was showing 6 days. As far as I can tell, the car only wakes up if you send a change to the car - like changing the battery Charge target from say 80% to 75%. This will wake the car and then the car will update Porsche central with the latest battery SoC and then this can be seen in the app.

 

[platypus]

i really think ppl should stop checking the battery everyday....do it once per week instead...or two weeks...if you must.

I pretty much never open the app, I’m aware the battery is losing SoC because it’s plugged and it restarts charging on its own every few days. I think at this point it’s clear that this is not happening because people refresh their Porsche app all the time.

 

[EVowner]

i really think ppl should stop checking the battery everyday....do it once per week instead...or two weeks...if you must.
It should be understood that you basically "starting" the car every time you open that app, as it has to poll alllllll the systems that the app reports on.

others have said, "that shouldn't be enough to cause 1% drain" ...but the question still remains as to why you need to monitor the battery level Daily

It does not really matter whether you open the door everyday or not. If you don't touch the car then upon getting to the car you will see your percentage plummet in real time. As you can see here car was parked in garage with 39% SoC

In video I am getting to the car 9.5 day later. In video you can also see comfort access not working until I pull the handle and long bootup of PCM. I have seen someone stating that car does this if it is not used for few days to save battery. Mine is doing this randomly even in day to day usage for some reason nor it seems to save battery...



Also if you would open app or even pull down to update data in it it will still show same SoC in the app meaning at least some part of the car has no idea about SoC drain until you open the door.

And to answer your question I absolutely hate going to my car every day when not used just, so I can take picture as evidence that this is happening every single day in hopes that somebody in service center will realize that this is really not normal behaviour and there is either something wrong with the battery or BMS and they will finally fix it.

My car is getting latest SW as I am writing this so maybe that will finally fix this problem as others mentioned. But at this stage I am really sceptical.

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