Battery draining while parked...is this normal?

[SergeyIndy]

^ Yes, this is how it is supposed to be.

Sponsored

 

[KLHubb]

When I charge in very cold nights, say to 75%, I find the SOC increases by a few % as the temp increases in the morning.

 

[Gino]

Hi all: New '22 CT4S owner here. One thing that I've noticed is that the battery will drain while sitting. Overnight it can drop by anywhere from 5-10%. The other day, sitting for 2 hours, I lost 10 miles - got to a destination with 51 miles of range remaining, about 3 hours later I left for home and it reported 41 miles remaining.

Is this normal? Any thoughts on what I might be missing or doing wrong?

I haven't been consistently turning off the car via the power button. I've assumed that the car turns off when I lock it. Should I be using the power button more consistently?

I'd appreciate any thoughts or experiences here. Thanks!

There is no way that is normal. Not sure if you have some setting keeping the car active but when I park my car for several days I see no more than 1-2 miles drop over that period and sometimes I’ve gone a week without driving it and lost never more than 5 miles.
I would document the drop in miles.
I do know if you have the driving mode set to “range” the miles go up maybe 5% but when you drive it again it defaults back to normal where the miles drop. Other than that there isn’t any reason I can think of that would cause that much of a drop.

 

[TreyWaters]

Thanks, everyone for your inputs. I went to document this last night/this morning, and naturally I woke up to the same SoC (45%) as I parked it yesterday afternoon. Oddly, though, my timer didn't run this morning.

What I'm wondering is if my disabled timers actually ran over Christmas break, and that is what caused my seen reduction in SoC. Since I wasn't going into work, I disabled the timers via the app. But, since I wasn't going anywhere early in the morning, I wouldn't know if the car was warming up for no one.

And for the difference in calculated range vs SoC - understood. I'll pay more attention to SoC rather than calculated range.

For the question on if there are any pre-existing timers that could be running since I did buy this car used - is there a way I can double check this? When I got the car (and on test drives), there was no user logged into the PCM. I had to use it as a guest. The only timers that show up when I'm logged in as me are mine.

I'll keep a close eye on this, and if I get another instance of this happening again I'll update.

 

[SergeyIndy]

Thanks, everyone for your inputs. I went to document this last night/this morning, and naturally I woke up to the same SoC (45%) as I parked it yesterday afternoon. Oddly, though, my timer didn't run this morning.

What I'm wondering is if my disabled timers actually ran over Christmas break, and that is what caused my seen reduction in SoC. Since I wasn't going into work, I disabled the timers via the app. But, since I wasn't going anywhere early in the morning, I wouldn't know if the car was warming up for no one.

And for the difference in calculated range vs SoC - understood. I'll pay more attention to SoC rather than calculated range.

For the question on if there are any pre-existing timers that could be running since I did buy this car used - is there a way I can double check this? When I got the car (and on test drives), there was no user logged into the PCM. I had to use it as a guest. The only timers that show up when I'm logged in as me are mine.

I'll keep a close eye on this, and if I get another instance of this happening again I'll update.

I would strongly recommend getting the OBD reader and checking your battery. Small price and not too much time to quickly check if any of your cells are going bad. Also, you will know your SoH.

 

[TreyWaters]

I would strongly recommend getting the OBD reader and checking your battery. Small price and not too much time to quickly check if any of your cells are going bad. Also, you will know your SoH.

I've got a cheap OBD2 reader...will play with that this weekend and see if I can find the battery voltages.

 

[whitex]

My SoC doesn’t drop at all. Even after 10 days of zero use, SoC remained the same.

Taycan hides some loss of SoC. Instead, your first trip afterwards will show higher consumption. If that trip is very short (e.g. 3 miles), you will see very high consumption after 10 days unplugged.

If you keep it plugged in, it tops off the charge every once in a while.

 

[Pete85]

I have had my 2021 Taycan 4S now for over 4 years with 82k km driven. I have now exprerienced the same as the OP for 3 days. Yesterday we had dinner for 1,5 hours and the charge dropped from 84 per cent to 81 during that time. Same happened in my garage here in Bavaria in the last 2 nights before yesterday. Also my normal range here is over 400km and now I only get 360km even if the weather is warm, around 25C.

Service in the nearby Porsche Center in Grainau is rubbish so I called my own service in Finland. He said this type of behaviour is very rare and he hasn't seen it before. He said though that they change faulty cells all the time.

In this case I really hope this is a faulty cell as they said that if the cell changes dont improve behaviour they will change the whole battery into the new 2025 one ??. And all with the new software.

Keeping my fingers crossed ?!! I got my service appointment for the 14th of July.

 

[prj]

My SoC doesn’t drop at all. Even after 10 days of zero use, SoC remained the same.

Same.

 

[Fish Fingers]

I have had my 2021 Taycan 4S now for over 4 years with 82k km driven. I have now exprerienced the same as the OP for 3 days. Yesterday we had dinner for 1,5 hours and the charge dropped from 84 per cent to 81 during that time. Same happened in my garage here in Bavaria in the last 2 nights before yesterday. Also my normal range here is over 400km and now I only get 360km even if the weather is warm, around 25C.

Service in the nearby Porsche Center in Grainau is rubbish so I called my own service in Finland. He said this type of behaviour is very rare and he hasn't seen it before. He said though that they change faulty cells all the time.

In this case I really hope this is a faulty cell as they said that if the cell changes dont improve behaviour they will change the whole battery into the new 2025 one ??. And all with the new software.

Keeping my fingers crossed ?!! I got my service appointment for the 14th of July.

https://www.taycanforum.com/forum/threads/sudden-25-drop-in-range.27370/

 

[D00notD00d]

Preheating the car overnight could have a big drop in soc if you are in a cold environment and you leave your car outside.
Mine is in a heated garage at home and I didn’t realize that I left the pre heating for 20 degrees at 8 am when I was in the mountains with the car left outside in the snow. The next morning I was surprised that I lost 10% but then realized that I didn’t have to remove any ice on the windows and my seat was nice and toasty

When I preheat in winter, the charging scheduler appears to add a couple of percentage points above the 80% target. I assumed that was to compensate, or some rebalancing.

 

[D00notD00d]

My car has dropped 5% SOC while sat at the dealer for almost 8 weeks. 5-10% drops overnight do not seem normal.

 

[Caraholic]

Be carful with your car. I have a hunch these cars that are loosing a substantial amount of hv battery while parked are the ones where the car frame gets fully charged. That’s what happened to mine and before it was diagnosed lost 80% of its battery from sitting for four weeks.

 

[anonymouse]

I don’t have this problem but if I leave the car parked for a while, I can see km range fluctuating 5-8km in negative then positive then going back to the initial range..

... which is why to determine whether there is a problem it is only meaningful to look at % state of charge and not the guess-o-meter (range) which is influenced by other things.

 

[r553]

Does the OP's car have any aftermarket items installed like dash cams or radar detectors?

Sponsored