battery warranty
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- Posts: 2
- Joined: Mon May 24, 2021 6:27 pm
The battery in my 2 year old Macan does not seem to be holding its charge very well. During driving it is being charged well up to 14.7 volts but when parked at home the voltage drops to less than 12 volts in a few days. I believe Porsche did not use to warranty batteries longer than about 12 months but my warranty documents do not mention any timescales. Any experiences?
Most batteries you can buy from Halfords have a 4 or 5-year warranty, so I can't see how Porsche can decline a warranty claim on a failed 2 year old battery.
Macan S collected 4 Dec 2017 - Jet Black, 20" SportDesign, Agate/Pebble, 18-way, Pano roof, Bi-Xenons with PDLS, Surround View, PASM, PS+, spare wheel, towbar.
2021 Audi TT Roadster Black Edition (hers)
2011 Freelander 2 (workhorse)
2021 Audi TT Roadster Black Edition (hers)
2011 Freelander 2 (workhorse)
I may be corrected on this, but I believe the 14.7 volts is a "charging" voltage supplied by the alternator ( In order to charge the battery, the applied charging voltage has to be higher than the battery's nominal 12 volts in order to "push power" into the battery).
However, when the car is sitting with the engine off (i.e. no charging voltage from the alternator) then it will just show its rated 12v (or slightly lower as there are still systems drawing power even when the car is standing) .
Hence I don't think there's a problem.
Same sort of thing applies to rechargeable batteries you may use at home. They are, say, 1.5v but the charger will apply, say, 1.75v to them to charge them. However, once charged and removed from the charger, they will provide their nominal 1.5v
However, when the car is sitting with the engine off (i.e. no charging voltage from the alternator) then it will just show its rated 12v (or slightly lower as there are still systems drawing power even when the car is standing) .
Hence I don't think there's a problem.
Same sort of thing applies to rechargeable batteries you may use at home. They are, say, 1.5v but the charger will apply, say, 1.75v to them to charge them. However, once charged and removed from the charger, they will provide their nominal 1.5v
Current car : Macan GTS Gen 2
Previous :
Macan Turbo Gen 1 - my 1st Porsche
BMW X1 (F48)
BMW M135i
Previous :
Macan Turbo Gen 1 - my 1st Porsche
BMW X1 (F48)
BMW M135i
Agreed, I suspect no long term issue, especial;;y if it is accepting charge whilst driving.GWL wrote: ↑Sun Jul 02, 2023 9:21 pm I may be corrected on this, but I believe the 14.7 volts is a "charging" voltage supplied by the alternator ( In order to charge the battery, the applied charging voltage has to be higher than the battery's nominal 12 volts in order to "push power" into the battery).
However, when the car is sitting with the engine off (i.e. no charging voltage from the alternator) then it will just show its rated 12v (or slightly lower as there are still systems drawing power even when the car is standing) .
Hence I don't think there's a problem.
Same sort of thing applies to rechargeable batteries you may use at home. They are, say, 1.5v but the charger will apply, say, 1.75v to them to charge them. However, once charged and removed from the charger, they will provide their nominal 1.5v
I find with modern battery protection systems and the drainage on a battery when vehicle left, it is best vehicle left on the likes of a CTEK charger if not to be used for a few days
2019 Macan S Porsche code PKW8WKI8
- Nuclear Nick
- Posts: 3820
- Joined: Wed Feb 17, 2016 3:42 pm
- Location: Bristol
This is normal, the battery is fine. No-load voltage will drop over a few days, into the 11 to 12 volts range while background electrical systems are operating, however the ECU will gradually shut down non essential systems in order to protect the battery capacity and maintain enough power to start the car. Standing no-load voltage is not an indication of remaining battery capacity. During this time a message may appear on the PCM screen that battery protection is operating and advising to start and run the car to recharge the battery.
Nick
Defender 90 V8
991.2 C2 GTS
Macan Turbo - sold
BMW K1300S, BMW R1250 GSA
Defender 90 V8
991.2 C2 GTS
Macan Turbo - sold
BMW K1300S, BMW R1250 GSA
After being parked for 10 days at the airport no such message was apparent on mine. I didn't think to look at the voltage, next time maybe....
http://www.porsche-code.com/PP37WLA6, a Dolomite Silver S, collected from Stockport OPC on Valentine's Day 2023, after a 399 day wait.
Ex.: Gen2 S, Volcano grey 1/9/19 - 3/2/23 & 39,235 Smiles, RIP
Ex.: Gen2 S, Volcano grey 1/9/19 - 3/2/23 & 39,235 Smiles, RIP
Correct, it’s not holding its charge very well or something is taking excess current when the car is lying idle (dash cam, immobiliser???). As others have said you can’t really tell the full health of a battery by simply checking the no-load voltage. However, for the battery to fall below 12v in just a few days, which is equates to about 50% discharged, does sound like it’s well past its best. It almost sounds like it’s previously had a deep discharge, with AGM batteries particularly that’s the beginning of the end.Ascotmacan wrote: ↑Sun Jul 02, 2023 7:40 pm The battery in my 2 year old Macan does not seem to be holding its charge very well. During driving it is being charged well up to 14.7 volts but when parked at home the voltage drops to less than 12 volts in a few days. I believe Porsche did not use to warranty batteries longer than about 12 months but my warranty documents do not mention any timescales. Any experiences?
Does the stop start function still operate? If the battery is weak the car will restart after only a few seconds as the voltage will have dropped to the starting threshold. Let us know how you get on with the warranty.
2022 Macan GTS & 718 GT4.
Past: Macan S, Audi S4 B8 Avant / Alfa 147 Q2 Diesel / Alfa 147 2.0 Selespeed
Past: Macan S, Audi S4 B8 Avant / Alfa 147 Q2 Diesel / Alfa 147 2.0 Selespeed
- Nuclear Nick
- Posts: 3820
- Joined: Wed Feb 17, 2016 3:42 pm
- Location: Bristol
How did you arrive at the ‘50% discharged’ figure?Alfanut wrote: ↑Mon Jul 03, 2023 10:49 pmCorrect, it’s not holding its charge very well or something is taking excess current when the car is lying idle (dash cam, immobiliser???). As others have said you can’t really tell the full health of a battery by simply checking the no-load voltage. However, for the battery to fall below 12v in just a few days, which is equates to about 50% discharged, does sound like it’s well past its best. It almost sounds like it’s previously had a deep discharge, with AGM batteries particularly that’s the beginning of the end.Ascotmacan wrote: ↑Sun Jul 02, 2023 7:40 pm The battery in my 2 year old Macan does not seem to be holding its charge very well. During driving it is being charged well up to 14.7 volts but when parked at home the voltage drops to less than 12 volts in a few days. I believe Porsche did not use to warranty batteries longer than about 12 months but my warranty documents do not mention any timescales. Any experiences?
Does the stop start function still operate? If the battery is weak the car will restart after only a few seconds as the voltage will have dropped to the starting threshold. Let us know how you get on with the warranty.
Nick
Defender 90 V8
991.2 C2 GTS
Macan Turbo - sold
BMW K1300S, BMW R1250 GSA
Defender 90 V8
991.2 C2 GTS
Macan Turbo - sold
BMW K1300S, BMW R1250 GSA
Some manufactures publish discharge tables but in general the discharge rate is a pretty steady and gentle slope between 12.8V down to around 12V which is roughly 50% of the capacity used on a lead acid battery. Beyond this things start to drop off rather quickly. There are a number of factors involved, current draw, temperature, etc.
Google “agm battery discharge chart” for some more info, for example :-
Google “agm battery discharge chart” for some more info, for example :-
2022 Macan GTS & 718 GT4.
Past: Macan S, Audi S4 B8 Avant / Alfa 147 Q2 Diesel / Alfa 147 2.0 Selespeed
Past: Macan S, Audi S4 B8 Avant / Alfa 147 Q2 Diesel / Alfa 147 2.0 Selespeed
fascinating.Alfanut wrote: ↑Tue Jul 04, 2023 10:24 am Some manufactures publish discharge tables but in general the discharge rate is a pretty steady and gentle slope between 12.8V down to around 12V which is roughly 50% of the capacity used on a lead acid battery. Beyond this things start to drop off rather quickly. There are a number of factors involved, current draw, temperature, etc.
Google “agm battery discharge chart” for some more info, for example :-
IMG_1454.jpeg
The graph after 120 hrs/ 5 days confirms the wisdom of leaving an AGM battery on the likes of a CTEK charger if left for any time
2019 Macan S Porsche code PKW8WKI8
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