Time to replace battery
Thread Starter
Racer
Joined: Jun 2012
Posts: 427
Likes: 45
From: Motor City, Detroit, MI
Time to replace battery
My 2020 C4S has been in hibernation. The Ctek wasnt performing and found the battery dead. I was able to jump the car and it started. I drove it for maybe 45 minutes, returned home, shut it off and again dead. I have read various threads about battery replacement. Do I really need to reprogram the car? I dont recall this with my previous 991. Should I just take it my independent repair shop?
Last edited by Porsche Jeff; Mar 12, 2025 at 12:05 AM.
Intermediate
Joined: Feb 2022
Posts: 34
Likes: 14
Quick question, slightly off topic. When you jump start your car, did you encounter any kind of errors or warning messages? When you connected your jumpers, did you connect the negative to the negative terminal or chassis?
Back to your question, I called my dealership to see how much it would cost them to replace, calibrate, etc. and they said $1500. When I called my independent dealer, they said you would still need to do some sort of calibration but it would cost $400-$600.
Back to your question, I called my dealership to see how much it would cost them to replace, calibrate, etc. and they said $1500. When I called my independent dealer, they said you would still need to do some sort of calibration but it would cost $400-$600.
Thread Starter
Racer
Joined: Jun 2012
Posts: 427
Likes: 45
From: Motor City, Detroit, MI
I did try to jump the battery by connecting to the chassis. It didnt work. The jump box I had used has a bypass mode for batteries that have 2 volts or less and the manual said to connect directly to the battery. I did that and it started right up. My check engine light was on and electronic parking brake warning light was flashing also. It said my ACC was disabled but I could drive.
My indie repair shop suggested having it towed in rather than driving it. My concern is I need to jump the car from the fuse box to open the drunk and get the towing hook thing out I believe.
My indie repair shop suggested having it towed in rather than driving it. My concern is I need to jump the car from the fuse box to open the drunk and get the towing hook thing out I believe.
Rennlist Member
Joined: Apr 2020
Posts: 1,955
Likes: 2,020
From: Ohio
If you have an AGM battery, you can pretty much replace it with anything (from Autozone eg Interstate battery), go with a LiPo option from Antigravity (recommend, as it is way lighter). With an AGM, you have tons of options and can pretty much do any type of battery without reprogramming. Whatever you do - do not buy a porsche battery from your dealer - waste of money and honestly not the best battery.
If you have a LiPo from the factory - you pretty much have to stick with porsche battery as the BMS does not allow you to switch to anything but a porsche battery/current lipo.
IF you are in the US and do not have RAS (rear axle steering) - you likely have an AGM, which gives you infinite options.
If you have a LiPo from the factory - you pretty much have to stick with porsche battery as the BMS does not allow you to switch to anything but a porsche battery/current lipo.
IF you are in the US and do not have RAS (rear axle steering) - you likely have an AGM, which gives you infinite options.
Racer
Joined: Nov 2024
Posts: 298
Likes: 184
I can't say enough good things about Antigravity batteries if you plan on keeping the car for a while. I believe @Antigravity has always said there's no need to code the car for the new battery.
I personally use 20Ah on my track/race cars (always on a tender), 40Ah on my garaged cars that can be put on a tender, and 60Ah on my cars that sit out on the street or in the driveway that never see a tender.
They're significantly lighter than the OE AGM battery, they last longer, they have a really cool built-in jump start feature, and they have posts built-in to the top of the battery for connecting pigtails for a tender.
I personally use 20Ah on my track/race cars (always on a tender), 40Ah on my garaged cars that can be put on a tender, and 60Ah on my cars that sit out on the street or in the driveway that never see a tender.
They're significantly lighter than the OE AGM battery, they last longer, they have a really cool built-in jump start feature, and they have posts built-in to the top of the battery for connecting pigtails for a tender.
Last edited by monoball; Mar 13, 2025 at 12:26 AM.
Rennlist Member
Joined: Aug 2020
Posts: 3,437
Likes: 3,522
From: Orange County California
The battery is precisely why I didn't check the Rear Axle Steering box when I ordered my C2S.
Next December it'll be five years and that's what I consider the Terminal safe and predicable, in-service, life span of a Lead/Acid battery.
Next December it'll be five years and that's what I consider the Terminal safe and predicable, in-service, life span of a Lead/Acid battery.
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Rennlist Member
Joined: Apr 2020
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From: Ohio
My 2020, 2022 with RAS came with LiPo. My 2024 992 with RAS came with AGM...
It appears from our posts in another thread, Porsche at least in the US market are shipping for 2024 all AGM batteries with or without RAS. Which is great for us, as gives of all options when switching out the battery when the time comes!
It appears from our posts in another thread, Porsche at least in the US market are shipping for 2024 all AGM batteries with or without RAS. Which is great for us, as gives of all options when switching out the battery when the time comes!