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YOUR RESEARCHBattery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
Leading reported evidence
Replace which is a bonus
Performed · outcome unconfirmed
No successful repair reported for this finding.
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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.
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Performed · outcome unconfirmed · Original poster
The Bosch S5 battery is smaller and considerably lighter than the battery it replaced which is a bonus.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
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Leading evidence: 'Replace which is a bonus' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check light' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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 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.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
Replace battery
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 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
Also, I've read the advice about keeping the ignition key in position 2 whilst changing the battery to stop the alarm going off and also that I may need to reset the window stop position.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
Reset clock and the various settings
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 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
Had to reset the clock and the various settings on my stereo head unit, but other than that all went as expected.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
Reset window stop position
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 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
Also, I've read the advice about keeping the ignition key in position 2 whilst changing the battery to stop the alarm going off and also that I may need to reset the window stop position.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
Replace battery
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
Also, I've read the advice about keeping the ignition key in position 2 whilst changing the battery to stop the alarm going off and also that I may need to reset the window stop position.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - PistonHeads UK
Reset window stop position
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
Also, I've read the advice about keeping the ignition key in position 2 whilst changing the battery to stop the alarm going off and also that I may need to reset the window stop position.
Battery advice for 2004 986 Boxster S - Page 1 - Boxster/Cayman - 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: 20261027T201111Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Yesterday morning I tried starting my Boxster and the battery was flat. Jump started the car and went driving for just over an hour. Tried starting this morning and the car did just about turn over and start but the starter motor did struggle as the battery was clearly low on charge. I have noticed that the same thing occur over the past few weeks if the car has not been driven for 4/5 days. I'm therefore assuming my battery is in need of replacement...
I have seen that Europarts sell a Bosch S5 battery and was hoping someone could confirm for sure whether this battery is suitable for my Boxster? Europarts website suggests it is, but just looking to double check.
http://www.eurocarparts.com/ecp/c/Porsche_Boxster_...
Also, I've read the advice about keeping the ignition key in position 2 whilst changing the battery to stop the alarm going off and also that I may need to reset the window stop position. I have a replacement Kenwood head unit so I don't think I need to worry about entering stereo codes, but are there any other things I need to do either before or after replacing the battery?
Thanks in advance.
That's what I stuck in my Cayman and yep, hell of an improvement over the POS Porsche battery.
My battery was shot when I swapped it. Alarm didn't go off and I had no issues with the radio. You'll get a check light for the PSM. That sorts itself out after a quick drive.
Battery fitted in about an hour this afternoon. Would have been 30 mins but it took me ages to find the right socket piece to fit the clamp that holds the battery down. The Bosch S5 battery is smaller and considerably lighter than the battery it replaced which is a bonus. I just followed the instructions in the owners manual + left ignition key in position 2. Had to reset the clock and the various settings on my stereo head unit, but other than that all went as expected. Starter motor turns over straight away now rather than sounding slightly labored.
Funnily enough my 2000 Boxster S did exactly this yesterday. I bought a 5 Year Warranty Bosch battery from Halfords for £92 + £7 to fit it. It now spins over a lot faster than it did before. That was trade card price, full price is £116
This is a source reference. Confirm exact model applicability in the original material.
