2013 Carrera S Battery Issues
Thread Starter
4th Gear
Joined: Sep 2022
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2013 Carrera S Battery Issues
Hi everyone,
Hoping for some guidance here.
I’ve owned my 991 for four years and it’s been great, except for one issue. In the last six months or so the battery is out of charge when I try to start the car, and it’s been happening more frequently. I had the battery replaced a few months ago, and things were okay for a while, but now it’s happening again.
i took it to my local Porsche dealer who claimed that everything is fine and his response was:
”the vehicle started up immediately without a prolonged crank, afterwards we did a Draw test on monday and the car passed, tuesday the vehicle sat for majority of the day, Today we performed anoth parasitic draw test and the car passed as again, everytime we would let the car sit for a long duration of time the car would start with no issue at all.
”
This is now about the fourth or fifth time that the battery has died a day after being fully charged. I make sure the doors are always locked, lights are off and no accessories are plugged in. Haven’t hooked it up to a trickle charger, but don’t think I need to since I’m daily driving it.
Just at a loss of what to do now. If the car still has this problem when I get it back I’m going to take it to a good independent shop in my area for a second opinion.
Wondering if anyone else has had similar experiences and what may be causing this?
Thanks in advance for any help…
Andrew
Hoping for some guidance here.
I’ve owned my 991 for four years and it’s been great, except for one issue. In the last six months or so the battery is out of charge when I try to start the car, and it’s been happening more frequently. I had the battery replaced a few months ago, and things were okay for a while, but now it’s happening again.
i took it to my local Porsche dealer who claimed that everything is fine and his response was:
”the vehicle started up immediately without a prolonged crank, afterwards we did a Draw test on monday and the car passed, tuesday the vehicle sat for majority of the day, Today we performed anoth parasitic draw test and the car passed as again, everytime we would let the car sit for a long duration of time the car would start with no issue at all.
”
This is now about the fourth or fifth time that the battery has died a day after being fully charged. I make sure the doors are always locked, lights are off and no accessories are plugged in. Haven’t hooked it up to a trickle charger, but don’t think I need to since I’m daily driving it.
Just at a loss of what to do now. If the car still has this problem when I get it back I’m going to take it to a good independent shop in my area for a second opinion.
Wondering if anyone else has had similar experiences and what may be causing this?
Thanks in advance for any help…
Andrew
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Go to an independent
Dealers are barely qualified to do oil changes any longer. You obviously have a draw somewhere batteries don't die without a draw. At some point after sitting for some time a draw occurs. Someone needs to let it sit and check for a draw at intervals. Dealers will be to stupid or lazy to execute this correctly.
Racer
Joined: Aug 2020
Posts: 344
Likes: 159
From: FORT LAUDERDALE
For what it's worth, I replaced my battery....with a bad "new" battery. Was OK at first and then wouldn't even hold a charge on a tender. Second one was fine. Typically once they loose all charge they do not get back to "full" capability. Can't emagine what would all of a sudden start a draw down in the last six months.
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From: Dickson, TN
Does the car really go to sleep after you lock it?
If you have the sport chrono does it go to 12 after about 30 seconds when you lock the car?
No aftermarket stereo stuff or phone charger plugged in?
If you have the sport chrono does it go to 12 after about 30 seconds when you lock the car?
No aftermarket stereo stuff or phone charger plugged in?
Thread Starter
4th Gear
Joined: Sep 2022
Posts: 4
Likes: 0
You would think a large service department at a dealership would be able to figure this out, but like a lot here have said, they’ve been pretty useless so far.
Thanks for all the responses so far.
Andrew
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That’s a good idea to check that. I believe it does have sport Chrono. It’s a PDK S-Model and it has the clock on the dash. I double checked to make sure no accessories are plugged in, but it wouldn’t hurt to check a third time. A USB drive is plugged in, but it’s just music on there.
You would think a large service department at a dealership would be able to figure this out, but like a lot here have said, they’ve been pretty useless so far.
Thanks for all the responses so far.
Andrew
You would think a large service department at a dealership would be able to figure this out, but like a lot here have said, they’ve been pretty useless so far.
Thanks for all the responses so far.
Andrew
I have a battery charger that has a both voltage and current draw readouts. This tells me if the car is drawing current when off. My 911 (991.2 GTS) is pretty good at goes to 0.0 amps when off (at 13.6 V), but my Macan GTS draws 0.4 amps when off with the car locked and off. Both cars have Sport Chrono.
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Instructor
Joined: Jul 2022
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Likes: 50
USB drives can draw power. Mine are hot to the touch so they are definitely pulling juice, even when the car is off. Also, do you have a radar detector plugged in? They will also draw power.
I have a battery charger that has a both voltage and current draw readouts. This tells me if the car is drawing current when off. My 911 (991.2 GTS) is pretty good at goes to 0.0 amps when off (at 13.6 V), but my Macan GTS draws 0.4 amps when off with the car locked and off. Both cars have Sport Chrono.
I have a battery charger that has a both voltage and current draw readouts. This tells me if the car is drawing current when off. My 911 (991.2 GTS) is pretty good at goes to 0.0 amps when off (at 13.6 V), but my Macan GTS draws 0.4 amps when off with the car locked and off. Both cars have Sport Chrono.
After charging the battery fully, 13.6 V for an AGM battery is the "floating mode". A healthy battery (if 70 Ah to 90 Ah) still will draw 0,05 A to 0,15 A, depending on age, temperature and health status. Infinetely (almost).
On top, even fully asleep, the car electronics will draw 0,02 A - 0,035 A. What you should expect to read after prolonged charging is something between 0,07A and 0,2 A.
I suspect your 991.2 GTS just switched off the connection to the charger (which it does under certain conditions) , and your Macan with 0,4 A may have a small problem.
Please remember : A residual current of 0.25 A accumulates to 6 Ah per day, 42 Ah per week.
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Thread Starter
4th Gear
Joined: Sep 2022
Posts: 4
Likes: 0
USB drives can draw power. Mine are hot to the touch so they are definitely pulling juice, even when the car is off. Also, do you have a radar detector plugged in? They will also draw power.
I have a battery charger that has a both voltage and current draw readouts. This tells me if the car is drawing current when off. My 911 (991.2 GTS) is pretty good at goes to 0.0 amps when off (at 13.6 V), but my Macan GTS draws 0.4 amps when off with the car locked and off. Both cars have Sport Chrono.
I have a battery charger that has a both voltage and current draw readouts. This tells me if the car is drawing current when off. My 911 (991.2 GTS) is pretty good at goes to 0.0 amps when off (at 13.6 V), but my Macan GTS draws 0.4 amps when off with the car locked and off. Both cars have Sport Chrono.
Since I’ve gotten the car returned, nothing’s been in the USB port and the battery has stayed charged, and it’s been sitting for the last three days and started up yesterday, so keeping my fingers crossed that things are okay now. If the problem continues, there’s an independent shop with good reviews (Arbormotion in AA) which I will take it to.
Last edited by KTM1290; Jun 22, 2025 at 11:36 AM.
1st Gear
Joined: Jun 2025
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Likes: 3
On Sunday I took my 2012 C2S off the trickle charger and backed it out of the garage to wash the dust off of it.
I had a Wed appt at the local dealer that sold the car new, but not to me., I have owned it 7 years 7k miles. This dealer has been the only place to service it since new. The original battery was replace April 2024. I did not put the trickle charger back on since it was going in on Wed for 2 tires. Got in it Wed and it would no turn over. Where it was in garage I couldn't get jumper cables on so put charger on and rescheduled for Fri. Tires on no problem. Battery check not so good. The Interstate battery which was is rated for 950 coca was reading only 488 after 14 months. So just because it's fairly new doesn't mean it can't be the problem.
The SA told me it's under warranty so no problem replacing it except I would need to pay the $289 installation fee again because Interstate Batteries only pays for the installation up to 12 months under warranty. I told the SA I didn't think it was right to change me again. In retrospect I should have asked to see if it was checked for ccw when installed but I didn't. He finally agreed that I would not have to pay for the installation. As I was walked to the cashier I was told if it happened again I would be expected to pay. After 7 years of annual service without question I felt it was beneath the dealership but it all the turnover I was wrong.
As a side note I always get surveyed shortly after leaving and requests until I fill them out. This time crickets. Will be looking for an independent to service it going forward.
I had a Wed appt at the local dealer that sold the car new, but not to me., I have owned it 7 years 7k miles. This dealer has been the only place to service it since new. The original battery was replace April 2024. I did not put the trickle charger back on since it was going in on Wed for 2 tires. Got in it Wed and it would no turn over. Where it was in garage I couldn't get jumper cables on so put charger on and rescheduled for Fri. Tires on no problem. Battery check not so good. The Interstate battery which was is rated for 950 coca was reading only 488 after 14 months. So just because it's fairly new doesn't mean it can't be the problem.
The SA told me it's under warranty so no problem replacing it except I would need to pay the $289 installation fee again because Interstate Batteries only pays for the installation up to 12 months under warranty. I told the SA I didn't think it was right to change me again. In retrospect I should have asked to see if it was checked for ccw when installed but I didn't. He finally agreed that I would not have to pay for the installation. As I was walked to the cashier I was told if it happened again I would be expected to pay. After 7 years of annual service without question I felt it was beneath the dealership but it all the turnover I was wrong.
As a side note I always get surveyed shortly after leaving and requests until I fill them out. This time crickets. Will be looking for an independent to service it going forward.
Rennlist Member
Joined: Jul 2019
Posts: 1,623
Likes: 420
If you connect a battery charger to your car that supplies 13.6 Volts , after the electronic circuit has gone to sleepimg mode and your battery is fully charged, you neither should read 0.0 Amperes nor 0.4 Amperes.
After charging the battery fully, 13.6 V for an AGM battery is the "floating mode". A healthy battery (if 70 Ah to 90 Ah) still will draw 0,05 A to 0,15 A, depending on age, temperature and health status. Infinetely (almost).
On top, even fully asleep, the car electronics will draw 0,02 A - 0,035 A. What you should expect to read after prolonged charging is something between 0,07A and 0,2 A.
I suspect your 991.2 GTS just switched off the connection to the charger (which it does under certain conditions) , and your Macan with 0,4 A may have a small problem.
Please remember : A residual current of 0.25 A accumulates to 6 Ah per day, 42 Ah per week.
After charging the battery fully, 13.6 V for an AGM battery is the "floating mode". A healthy battery (if 70 Ah to 90 Ah) still will draw 0,05 A to 0,15 A, depending on age, temperature and health status. Infinetely (almost).
On top, even fully asleep, the car electronics will draw 0,02 A - 0,035 A. What you should expect to read after prolonged charging is something between 0,07A and 0,2 A.
I suspect your 991.2 GTS just switched off the connection to the charger (which it does under certain conditions) , and your Macan with 0,4 A may have a small problem.
Please remember : A residual current of 0.25 A accumulates to 6 Ah per day, 42 Ah per week.
Rennlist Member
Joined: Jul 2019
Posts: 1,623
Likes: 420
On Sunday I took my 2012 C2S off the trickle charger and backed it out of the garage to wash the dust off of it.
I had a Wed appt at the local dealer that sold the car new, but not to me., I have owned it 7 years 7k miles. This dealer has been the only place to service it since new. The original battery was replace April 2024. I did not put the trickle charger back on since it was going in on Wed for 2 tires. Got in it Wed and it would no turn over. Where it was in garage I couldn't get jumper cables on so put charger on and rescheduled for Fri. Tires on no problem. Battery check not so good. The Interstate battery which was is rated for 950 coca was reading only 488 after 14 months. So just because it's fairly new doesn't mean it can't be the problem.
The SA told me it's under warranty so no problem replacing it except I would need to pay the $289 installation fee again because Interstate Batteries only pays for the installation up to 12 months under warranty. I told the SA I didn't think it was right to change me again. In retrospect I should have asked to see if it was checked for ccw when installed but I didn't. He finally agreed that I would not have to pay for the installation. As I was walked to the cashier I was told if it happened again I would be expected to pay. After 7 years of annual service without question I felt it was beneath the dealership but it all the turnover I was wrong.
As a side note I always get surveyed shortly after leaving and requests until I fill them out. This time crickets. Will be looking for an independent to service it going forward.
I had a Wed appt at the local dealer that sold the car new, but not to me., I have owned it 7 years 7k miles. This dealer has been the only place to service it since new. The original battery was replace April 2024. I did not put the trickle charger back on since it was going in on Wed for 2 tires. Got in it Wed and it would no turn over. Where it was in garage I couldn't get jumper cables on so put charger on and rescheduled for Fri. Tires on no problem. Battery check not so good. The Interstate battery which was is rated for 950 coca was reading only 488 after 14 months. So just because it's fairly new doesn't mean it can't be the problem.
The SA told me it's under warranty so no problem replacing it except I would need to pay the $289 installation fee again because Interstate Batteries only pays for the installation up to 12 months under warranty. I told the SA I didn't think it was right to change me again. In retrospect I should have asked to see if it was checked for ccw when installed but I didn't. He finally agreed that I would not have to pay for the installation. As I was walked to the cashier I was told if it happened again I would be expected to pay. After 7 years of annual service without question I felt it was beneath the dealership but it all the turnover I was wrong.
As a side note I always get surveyed shortly after leaving and requests until I fill them out. This time crickets. Will be looking for an independent to service it going forward.
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Hi everyone,
Hoping for some guidance here.
I’ve owned my 991 for four years and it’s been great, except for one issue. In the last six months or so the battery is out of charge when I try to start the car, and it’s been happening more frequently. I had the battery replaced a few months ago, and things were okay for a while, but now it’s happening again.
i took it to my local Porsche dealer who claimed that everything is fine and his response was:
”the vehicle started up immediately without a prolonged crank, afterwards we did a Draw test on monday and the car passed, tuesday the vehicle sat for majority of the day, Today we performed anoth parasitic draw test and the car passed as again, everytime we would let the car sit for a long duration of time the car would start with no issue at all.
”
This is now about the fourth or fifth time that the battery has died a day after being fully charged. I make sure the doors are always locked, lights are off and no accessories are plugged in. Haven’t hooked it up to a trickle charger, but don’t think I need to since I’m daily driving it.
Just at a loss of what to do now. If the car still has this problem when I get it back I’m going to take it to a good independent shop in my area for a second opinion.
Wondering if anyone else has had similar experiences and what may be causing this?
Thanks in advance for any help…
Andrew
Hoping for some guidance here.
I’ve owned my 991 for four years and it’s been great, except for one issue. In the last six months or so the battery is out of charge when I try to start the car, and it’s been happening more frequently. I had the battery replaced a few months ago, and things were okay for a while, but now it’s happening again.
i took it to my local Porsche dealer who claimed that everything is fine and his response was:
”the vehicle started up immediately without a prolonged crank, afterwards we did a Draw test on monday and the car passed, tuesday the vehicle sat for majority of the day, Today we performed anoth parasitic draw test and the car passed as again, everytime we would let the car sit for a long duration of time the car would start with no issue at all.
”
This is now about the fourth or fifth time that the battery has died a day after being fully charged. I make sure the doors are always locked, lights are off and no accessories are plugged in. Haven’t hooked it up to a trickle charger, but don’t think I need to since I’m daily driving it.
Just at a loss of what to do now. If the car still has this problem when I get it back I’m going to take it to a good independent shop in my area for a second opinion.
Wondering if anyone else has had similar experiences and what may be causing this?
Thanks in advance for any help…
Andrew
ON another note we sell a bluetooth device that tracks all the voltage data from you battery and you can view all that on your phone. So you can know the effects of the parastic draw on your battery and how fast is draining it. It will show if you charging system is charging and how much while driving, it does a start test showing the voltage drop which is important to see if you battery is failing because the voltage drop on starting will get low... plus a few cool other things. Its reallty helpful for analyzing and tracking issues like this. Also alerts you of low battery ... all via bluetooth.
Link Battery Tracker...https://antigravitybatteries.com/pro...tooth-tracker/
Video
Thread Starter
4th Gear
Joined: Sep 2022
Posts: 4
Likes: 0
As several said the USB Devices though they seem innocent can draw pretty high for the small things they do because these companies aren't concerned with how efficient the energy they are using is. For example we tracked a 12w usb charger drawing 2 amps which is just crazy for something so simple. So hopefully your problem is cured.
ON another note we sell a bluetooth device that tracks all the voltage data from you battery and you can view all that on your phone. So you can know the effects of the parastic draw on your battery and how fast is draining it. It will show if you charging system is charging and how much while driving, it does a start test showing the voltage drop which is important to see if you battery is failing because the voltage drop on starting will get low... plus a few cool other things. Its reallty helpful for analyzing and tracking issues like this. Also alerts you of low battery ... all via bluetooth.
Link Battery Tracker...https://antigravitybatteries.com/pro...tooth-tracker/
Video
https://www.youtube.com/watch?v=auDkMx9HEHY
ON another note we sell a bluetooth device that tracks all the voltage data from you battery and you can view all that on your phone. So you can know the effects of the parastic draw on your battery and how fast is draining it. It will show if you charging system is charging and how much while driving, it does a start test showing the voltage drop which is important to see if you battery is failing because the voltage drop on starting will get low... plus a few cool other things. Its reallty helpful for analyzing and tracking issues like this. Also alerts you of low battery ... all via bluetooth.
Link Battery Tracker...https://antigravitybatteries.com/pro...tooth-tracker/
Video
https://www.youtube.com/watch?v=auDkMx9HEHY
Take care, Andrew
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Joined: Mar 2021
Posts: 1,791
Likes: 582
From: Hockley TX
All the above but for whatever it's worth I use a trickle charger the car lives on which helps down here in the Texas heat. Once I pull the car in, I toss fans on the front to cool it and the trickle charger is plugged in......