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992 Battery issues and the Porsche “Gotcha”

16202 Views 72 Replies 16 Participants Last post by  Aircooled
Hi everyone,

I want to alert all 992 owners (possibly earlier models as well) to an issue I ran into recently. I received my 992 C2S in January of 2021. From then until December 27th of 2021, I put a little over 2700 miles on it. It is kept in a garage and is lovingly cared for. This winter, we are in Florida (home is Philly), and since the car arrived here in early January, I’ve put 800 miles on it. It’s great to be able to drive it in the sun and warm weather.

However, a couple of weeks ago, I went to the gym and was there for about 90 minutes. I then went to the local DIY hand wash car wash to wash and dry the car. From their I stopped at the gas station to fill up. Once the car was full, I went to start it and while the dash lit up (not the PCM screen), the car did not start. It didn’t even turn over. It was DOA. I called my dealer in Philly and they walked me through a couple of things to try and still nothing. I then called Porsche assistance and had the car towed to the local Porsche dealer here in SW Florida. The service associate who received my car called and asked why I had the car towed in because it started up with no issues when she tried. The tow guys confirmed that it was dead when they picked it up from me. She decided to keep the car and try to figure out what was going on. After a week of waiting, I received a text with a link to receive and estimate of the work needed. The estimate was for north of $1,300.00 for a replacement battery and labor. As you can imagine, I was not amused. The dealer explained that Porsche “requires” at least 6000 miles to be driven in a 12 month period in order not to void the battery warranty. I was never informed of this by my dealer in Philly, nor was I told that buying a battery maintainer would avoid this issue completely.

I made both dealers talk to each other to figure out who was going to pay for this work as I certainly was not. At the end of the day, the battery charged up completely and two of the other metrics on the battery were above levels that would indicate the need to replace the battery. My dealer in Philly is receiving the car directly when I ship it back home at the end of March and will do their own set of diagnostic tests to see if replacing the battery is warranted. In the meantime I did purchase a CTek maintainer to use while I’m here to avoid another stranding by my car.

I’m curious if anyone else has run into this issue?

I love the car and my wife owns a Macan S so we’re certainly Porsche people, but this felt greasy and cheap and not what I’d expect from Porsche. I have not called Porsche customer support directly, but plan to do so before I leave for home.

So, if you don’t put a lot of miles on your 992, be aware that this issue may arise.
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Your charger seems to have two charging modes for Porsche 12V lead-acid batteries and Porsche 12V lithium-ion batteries (12V LiFePO)

My understanding is Lithium was an orderable option... not a STANDARD battery the 992 came with.
I tgh8ink it comes with rear axle steering. Other than that I am not sure on the various trims so before I gave advice that could toast his battery I told him its best to be sure . I almost toasted mine . I had it hooked up and it all looked great . Shortly after I had doubt and thats when I started learning . With the technical things of the 992 I am still a newbie .
Tire Wheel Vehicle Car Hood

I tgh8ink it comes with rear axle steering. Other than that I am not sure on the various trims so before I gave advice that could toast his battery I told him its best to be sure . I almost toasted mine . I had it hooked up and it all looked great . Shortly after I had doubt and thats when I started learning . With the technical things of the 992 I am still a newbie .
Here is your car in a Targa.
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View attachment 696

Here is your car in a Targa.
Blech ... The GTS Targa is the only variant so heavy that they could not even put the GTS suspension on it . That black stone guard is hideous . Mine has ceramics . The Targa is the only 911 that if someone gave it to me I would sell it . There is nothing about the car that I like . Even the styling where a classic concept is fused with a modern car just doesn't cut it for me . I know that Targa guys LOVE the car . TYHey also are rare and hard to get. I am one less shopper competing for one .
Hi everyone,

I want to alert all 992 owners (possibly earlier models as well) to an issue I ran into recently. I received my 992 C2S in January of 2021. From then until December 27th of 2021, I put a little over 2700 miles on it. It is kept in a garage and is lovingly cared for. This winter, we are in Florida (home is Philly), and since the car arrived here in early January, I’ve put 800 miles on it. It’s great to be able to drive it in the sun and warm weather.

However, a couple of weeks ago, I went to the gym and was there for about 90 minutes. I then went to the local DIY hand wash car wash to wash and dry the car. From their I stopped at the gas station to fill up. Once the car was full, I went to start it and while the dash lit up (not the PCM screen), the car did not start. It didn’t even turn over. It was DOA. I called my dealer in Philly and they walked me through a couple of things to try and still nothing. I then called Porsche assistance and had the car towed to the local Porsche dealer here in SW Florida. The service associate who received my car called and asked why I had the car towed in because it started up with no issues when she tried. The tow guys confirmed that it was dead when they picked it up from me. She decided to keep the car and try to figure out what was going on. After a week of waiting, I received a text with a link to receive and estimate of the work needed. The estimate was for north of $1,300.00 for a replacement battery and labor. As you can imagine, I was not amused. The dealer explained that Porsche “requires” at least 6000 miles to be driven in a 12 month period in order not to void the battery warranty. I was never informed of this by my dealer in Philly, nor was I told that buying a battery maintainer would avoid this issue completely.

I made both dealers talk to each other to figure out who was going to pay for this work as I certainly was not. At the end of the day, the battery charged up completely and two of the other metrics on the battery were above levels that would indicate the need to replace the battery. My dealer in Philly is receiving the car directly when I ship it back home at the end of March and will do their own set of diagnostic tests to see if replacing the battery is warranted. In the meantime I did purchase a CTek maintainer to use while I’m here to avoid another stranding by my car.

I’m curious if anyone else has run into this issue?

I love the car and my wife owns a Macan S so we’re certainly Porsche people, but this felt greasy and cheap and not what I’d expect from Porsche. I have not called Porsche customer support directly, but plan to do so before I leave for home.

So, if you don’t put a lot of miles on your 992, be aware that this issue may arise.
Dear 992 people

Today I also was washing my 992 for maybe 1hour and 30 minutes, off course key was turned off, maybe occasional opening of trunk room. After the wash, the car does not start and I had to call road service to charge the battery, however the road service guy said the battery had 12 Volts and not so bad condition because I actually got new one 2 month ago. I called Porsche dealer and they said I need to run the car for at least 1hour to charge. I regularly drive my car to the work for 30 minutes a day and use cetek everyday. I think the new 992 use electricity every minutes to run computer compared to 991. My old 991 did not have this kind of trouble. So I think Porsche should come out with better solution.
Dear 992 people

Today I also was washing my 992 for maybe 1hour and 30 minutes, off course key was turned off, maybe occasional opening of trunk room. After the wash, the car does not start and I had to call road service to charge the battery, however the road service guy said the battery had 12 Volts and not so bad condition because I actually got new one 2 month ago. I called Porsche dealer and they said I need to run the car for at least 1hour to charge. I regularly drive my car to the work for 30 minutes a day and use cetek everyday. I think the new 992 use electricity every minutes to run computer compared to 991. My old 991 did not have this kind of trouble. So I think Porsche should come out with better solution.
That shouldn’t happen in that short period of time, thanks for sharing.
Dear 992 people

Today I also was washing my 992 for maybe 1hour and 30 minutes, off course key was turned off, maybe occasional opening of trunk room. After the wash, the car does not start and I had to call road service to charge the battery, however the road service guy said the battery had 12 Volts and not so bad condition because I actually got new one 2 month ago. I called Porsche dealer and they said I need to run the car for at least 1hour to charge. I regularly drive my car to the work for 30 minutes a day and use cetek everyday. I think the new 992 use electricity every minutes to run computer compared to 991. My old 991 did not have this kind of trouble. So I think Porsche should come out with better solution.
Short drives are not good for the car in many ways . The battery needs more time to charge so ideally a 45 minute drive or longer is a good thing . That does not mean occasional short drives are bad but if its the bulk of the drives its not enough. Also cars that sit a long time can develop little leaks and such. Even though I let my car sit for 8 months when Covid first hit in 2020 I know its not good . I was fortunate but many other guys have not been . The perfect amount is at least 3 drives a week for 45 min or longer . Of course not everyone can do this but the further one moves away from doing it the more issues can arise.
Short drives are not good for the car in many ways . The battery needs more time to charge so ideally a 45 minute drive or longer is a good thing . That does not mean occasional short drives are bad but if its the bulk of the drives its not enough. Also cars that sit a long time can develop little leaks and such. Even though I let my car sit for 8 months when Covid first hit in 2020 I know its not good . I was fortunate but many other guys have not been . The perfect amount is at least 3 drives a week for 45 min or longer . Of course not everyone can do this but the further one moves away from doing it the more issues can arise.
I’ve been driving everyday since it’s been so nice but I agree you need to drive longer not shorter same as my bike. Perfect weather here today!
Wheel Tire Fuel tank Vehicle Helmet
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I let my Macan, MB sit for 4 months at a time (once it was 6 months) never had a problem starting. My 991.2 failed once. It also sits idle few months at a time. I am getting a bit concerned. Will have to figure out how to bring power to my parking spots. The only option I see for the 992. Spoke to my dealer about it, and he suggests trickle charge 100%.
Hi everyone, I want to alert all 992 owners (possibly earlier models as well) to an issue I ran into recently. I received my 992 C2S in January of 2021. From then until December 27th of 2021, I put a little over 2700 miles on it. It is kept in a garage and is lovingly cared for. This winter, we are in Florida (home is Philly), and since the car arrived here in early January, I’ve put 800 miles on it. It’s great to be able to drive it in the sun and warm weather. However, a couple of weeks ago, I went to the gym and was there for about 90 minutes. I then went to the local DIY hand wash car wash to wash and dry the car. From their I stopped at the gas station to fill up. Once the car was full, I went to start it and while the dash lit up (not the PCM screen), the car did not start. It didn’t even turn over. It was DOA. I called my dealer in Philly and they walked me through a couple of things to try and still nothing. I then called Porsche assistance and had the car towed to the local Porsche dealer here in SW Florida. The service associate who received my car called and asked why I had the car towed in because it started up with no issues when she tried. The tow guys confirmed that it was dead when they picked it up from me. She decided to keep the car and try to figure out what was going on. After a week of waiting, I received a text with a link to receive and estimate of the work needed. The estimate was for north of $1,300.00 for a replacement battery and labor. As you can imagine, I was not amused. The dealer explained that Porsche “requires” at least 6000 miles to be driven in a 12 month period in order not to void the battery warranty. I was never informed of this by my dealer in Philly, nor was I told that buying a battery maintainer would avoid this issue completely. I made both dealers talk to each other to figure out who was going to pay for this work as I certainly was not. At the end of the day, the battery charged up completely and two of the other metrics on the battery were above levels that would indicate the need to replace the battery. My dealer in Philly is receiving the car directly when I ship it back home at the end of March and will do their own set of diagnostic tests to see if replacing the battery is warranted. In the meantime I did purchase a CTek maintainer to use while I’m here to avoid another stranding by my car. I’m curious if anyone else has run into this issue? I love the car and my wife owns a Macan S so we’re certainly Porsche people, but this felt greasy and cheap and not what I’d expect from Porsche. I have not called Porsche customer support directly, but plan to do so before I leave for home. So, if you don’t put a lot of miles on your 992, be aware that this issue may arise.
I bought the Porsche battery tender with the clamps (with the 992 the 12V socket shuts down 30 min after car is off) and I can't seem to get it to work. It charges to max then the lights on the tender start to blink. The trouble shooting info doesn't provide guidance for this issue. Can anyone help?
I have the same thing same problem junk Already ripped champion a new a hole
I have the same thing same problem junk Already ripped champion a new a hole
I have the same issue with my Oct 2022 992 4GTS with the lithium battery (RAS). The 12 volt accessory socket shuts down when trickle charging with the Porsche Charge O Mat Pro (made by CTEK). It is not a daily driver and after reading the forums I knew I had to trickle charge the lithium battery. I have followed the steps that others have recommended on this forum. Thank You to those members (see below).

I still cannot get a consistent daily trickle charge. Sometimes it works up to 5 days, other times it shuts down on the first overnight. My Porsche Rep spoke to Porsche Technical and their answer is to purchase the alligator clamps. Great solution for a long term period, but not weekly. Porsche Downtown Toronto (Michael) was very helpful, but their steps also did not work.

If anybody can find the flaw in the below steps, I would appreciate your input.

My other thought was to splice the CTEK hard wire connections to the Porsche Maintainer. Did not purchase the CTEK since I knew Porsche would probably void my battery warranty since not oem. Working to get my 6K miles in first year.

1) Keep Key Fob on seat
2) Connect maintainer to 12 volt accessory socket
3) Turn On ignition to accessory position. Maintain this status for 30 to 60 seconds
4) Connect maintainer to AC wall outlet
5) Choose the correct mode on your maintainer. If Lithium, keep Mode button depressed for 10 secs (maintainer manual). Maintain this status for 30 to 60 seconds
6) Turn Off ignition
7) Remove Key Fob and Lock the vehicle
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I have the same issue with my Oct 2022 992 4GTS with the lithium battery (RAS). The 12 volt accessory socket shuts down when trickle charging with the Porsche Charge O Mat Pro (made by CTEK). It is not a daily driver and after reading the forums I knew I had to trickle charge the lithium battery. I have followed the steps that others have recommended on this forum. Thank You to those members (see below).

I still cannot get a consistent daily trickle charge. Sometimes it works up to 5 days, other times it shuts down on the first overnight. My Porsche Rep spoke to Porsche Technical and their answer is to purchase the alligator clamps. Great solution for a long term period, but not weekly. Porsche Downtown Toronto (Michael) was very helpful, but their steps also did not work.

If anybody can find the flaw in the below steps, I would appreciate your input.

My other thought was to splice the CTEK hard wire connections to the Porsche Maintainer. Did not purchase the CTEK since I knew Porsche would probably void my battery warranty since not oem. Working to get my 6K miles in first year.

1) Keep Key Fob on seat
2) Connect maintainer to 12 volt accessory socket
3) Turn On ignition to accessory position. Maintain this status for 30 to 60 seconds
4) Connect maintainer to AC wall outlet
5) Choose the correct mode on your maintainer. If Lithium, keep Mode button depressed for 10 secs (maintainer manual). Maintain this status for 30 to 60 seconds
6) Turn Off ignition
7) Remove Key Fob and Lock the vehicle
So that’s the procedure for my “regular” battery but its weird that it doesn’t apply to Lithium. Clips should solve it I would think.
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Hi everyone,

I want to alert all 992 owners (possibly earlier models as well) to an issue I ran into recently. I received my 992 C2S in January of 2021. From then until December 27th of 2021, I put a little over 2700 miles on it. It is kept in a garage and is lovingly cared for. This winter, we are in Florida (home is Philly), and since the car arrived here in early January, I’ve put 800 miles on it. It’s great to be able to drive it in the sun and warm weather.

However, a couple of weeks ago, I went to the gym and was there for about 90 minutes. I then went to the local DIY hand wash car wash to wash and dry the car. From their I stopped at the gas station to fill up. Once the car was full, I went to start it and while the dash lit up (not the PCM screen), the car did not start. It didn’t even turn over. It was DOA. I called my dealer in Philly and they walked me through a couple of things to try and still nothing. I then called Porsche assistance and had the car towed to the local Porsche dealer here in SW Florida. The service associate who received my car called and asked why I had the car towed in because it started up with no issues when she tried. The tow guys confirmed that it was dead when they picked it up from me. She decided to keep the car and try to figure out what was going on. After a week of waiting, I received a text with a link to receive and estimate of the work needed. The estimate was for north of $1,300.00 for a replacement battery and labor. As you can imagine, I was not amused. The dealer explained that Porsche “requires” at least 6000 miles to be driven in a 12 month period in order not to void the battery warranty. I was never informed of this by my dealer in Philly, nor was I told that buying a battery maintainer would avoid this issue completely.

I made both dealers talk to each other to figure out who was going to pay for this work as I certainly was not. At the end of the day, the battery charged up completely and two of the other metrics on the battery were above levels that would indicate the need to replace the battery. My dealer in Philly is receiving the car directly when I ship it back home at the end of March and will do their own set of diagnostic tests to see if replacing the battery is warranted. In the meantime I did purchase a CTek maintainer to use while I’m here to avoid another stranding by my car.

I’m curious if anyone else has run into this issue?

I love the car and my wife owns a Macan S so we’re certainly Porsche people, but this felt greasy and cheap and not what I’d expect from Porsche. I have not called Porsche customer support directly, but plan to do so before I leave for home.

So, if you don’t put a lot of miles on your 992, be aware that this issue may arise.
Many cars today with electronic door locks will have issues with access if the battery dies. What I don’t understand is why you can’t use a lead acid battery or why anyone would pay thousands for a battery. Am I missing something?
Many cars today with electronic door locks will have issues with access if the battery dies. What I don’t understand is why you can’t use a lead acid battery or why anyone would pay thousands for a battery. Am I missing something?
Apparently it’s not as easy to change as you’d think. There’s a battery management system with the lithium battery and the car will throw codes if you put an AGM in it’s place.
There must be a reason why they are putting these batteries in. Lets just hope they do not start failing…
There must be a reason why they are putting these batteries in. Lets just hope they do not start failing…
There’s a huge discussion on RL. There have been some failures and the $2k+ cost to replace it with an OEM battery is one issue. The bigger issue is that guys have had to wait for weeks for a replacement from Porsche due to supply shortages.

Previous gen 911’s have used AGM’s with RAS but I don’t know of anyone that’s successfully swapped one on a 992. yet. Lithium batteries are lighter which I suspect is one reason they’re on 992’s. The higher demand of the RAS might be another reason but that’s speculation on my part.

A company called antigravity battery is working towards a way to make their lithium batteries work so hopefully there will be an option to the OEM battery. I’d feel violated spending over $2k on a car battery.

FYI - apparently all Canadian cars come with lithium batteries whether you have RAS or not.
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There’s a huge discussion on RL. There have been some failures and the $2k+ cost to replace it with an OEM battery is one issue. The bigger issue is that guys have had to wait for weeks for a replacement from Porsche due to supply shortages.

Previous gen 911’s have used AGM’s with RAS but I don’t know of anyone that’s successfully swapped one on a 992. yet. Lithium batteries are lighter which I suspect is one reason they’re on 992’s. The higher demand of the RAS might be another reason but that’s speculation on my part.

A company called antigravity battery is working towards a way to make their lithium batteries work so hopefully there will be an option to the OEM battery. I’d feel violated spending over $2k on a car battery.

FYI - apparently all Canadian cars come with lithium batteries whether you have RAS or not.
Good info and glad I don’t have one!
Mine does not have RAS and I have the lithium one.
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