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Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

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6 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

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YOUR RESEARCHBattery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Leading reported evidence

Replace battery

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
Just replaced the battery on my 997 for a second time, and a new shiny Bosch S5-110 85AH was only about £2 dearer than it was five years ago at £103 delivered.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Performed · outcome unconfirmed
Just replaced the battery on my 997 for a second time, and a new shiny Bosch S5-110 85AH was only about £2 dearer than it was five years ago at £103 delivered.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Read full discussion summary

Leading evidence: 'Replace battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace battery' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 6 captured posts examined · 1 partial discussions

Compare 2 other evidence results

Use /extended warranty - it will need

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed
Porsche used/extended warranty - it will need to be 'genuine'
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Run yesterday so guess a replacement would be due

Suggestion or failed attempt

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion · Original poster
Checked this morning and it’s at 11.9V after a run yesterday so guess a replacement would be due.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Suggestion
Checked this morning and it’s at 11.9V after a run yesterday so guess a replacement would be due.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace battery

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
Just replaced the battery on my 997 for a second time, and a new shiny Bosch S5-110 85AH was only about £2 dearer than it was five years ago at £103 delivered.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Performed · outcome unconfirmed
Just replaced the battery on my 997 for a second time, and a new shiny Bosch S5-110 85AH was only about £2 dearer than it was five years ago at £103 delivered.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Run yesterday so guess a replacement would be due

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Checked this morning and it’s at 11.9V after a run yesterday so guess a replacement would be due.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Suggestion
Checked this morning and it’s at 11.9V after a run yesterday so guess a replacement would be due.
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Use /extended warranty - it will need

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed
Porsche used/extended warranty - it will need to be 'genuine'
Original post Read captured discussion
Battery replacement 991 - Page 1 - Porsche General - PistonHeads UK

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

PistonHeads: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Morning, I’ve recently had some minor random electrical gremlins on my 991.1 911CS and traced it to a discharged battery. Checked this morning and it’s at 11.9V after a run yesterday so guess a replacement would be due. I will Ctek it later just to be sure though. Do I need to replace it with a Porsche branded one or can I just dump a Silver Bosch/Varta in its place? Is there any coding required? Many thanks

POST 2Original post

Death by Saints said: Morning, I’ve recently had some minor random electrical gremlins on my 991.1 911CS and traced it to a discharged battery. Checked this morning and it’s at 11.9V after a run yesterday so guess a replacement would be due. I will Ctek it later just to be sure though. Do I need to replace it with a Porsche branded one or can I just dump a Silver Bosch/Varta in its place? Is there any coding required? Many thanks Porsche used/extended warranty - it will need to be 'genuine' No warranty from Porsche - fit whatever you want. If you have stop/start the new battery will likely need 'coding' to the car.

POST 3 / ORIGINAL POSTEROriginal post

Thanks for the reply, much appreciated. It has stop/start but I have read opinions varying from ‘coding is essential’ to ‘don’t bother’ as it’ll learn the battery is new over the next 6 hours of driving. I coded my Audi S4 battery myself but don’t have access to the Porsche software and am not convinced it was necessary. I guess I’ll give the stealers a call in the morning to see how much they charge which will probably make my mind up for me. Thanks again.

POST 4Original post

Give Tayna Batteries a go. Just replaced the battery on my 997 for a second time, and a new shiny Bosch S5-110 85AH was only about £2 dearer than it was five years ago at £103 delivered.

POST 5 / ORIGINAL POSTEROriginal post

STiG911 said: Give Tayna Batteries a go. Just replaced the battery on my 997 for a second time, and a new shiny Bosch S5-110 85AH was only about £2 dearer than it was five years ago at £103 delivered. That’s exactly what I’m about to do but thanks for the advice. I’ve found an identical Banner AGM replacement albeit without the Porsche logo/markup for £150.

POST 6Original post

It's a pretty easy job to do, whatever battery you put in. Just make sure you have someone to help you and a piece of wood so both of you can lift the battery up towards where it goes - it's too difficult to reach in on your own (well unless you have unbelievably strong arms and a very strong back)! Plug the CTEK in before you start, this will hold the cars electrics up while you swap the battery and should mean you dont need anything recoded or reset. Did my 991 Turbo earlier this year - I think it took 30 minutes altogether.

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