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Battery

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graham.webb
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graham.webb PCGB Member
2021/07/17 18:49:49 (permalink)

Battery

My Bosch S3 70Ah, fitted at Promax (that's how old it is!) seems not to be holding a charge very well.
 
70Ah is what Promax recommended (standard spec?) but I recall some discussion years ago about bigger capacity to improve cranking.
 
Any thoughts?

Graham
'91 944 S2: Alpine white

9 Replies

ShaunHenstridge
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Re: Battery 2021/07/20 14:53:18 (permalink)
Hi, as a matter of interest, i have literally just changed my battery today. I'd noticed that the current Bosch S4 was no longer up to the job. Mind you, it was 11 years old. I mentioned the larger capacity option to my local battery specialist and they initially recommended a Varta with a 4 year warranty which was 77Ah. Unfortunately, when they fitted it it stood slightly proud, so changed it for an alternative Varta battery which was not quite as high, but came in a 74Ah. Total cost was £107.00 all in, so I was quite happy. It certainly cranks over much better now. Hope that helps.
blade7
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blade7 Guest of the Club
Re: Battery 2021/07/20 18:40:35 (permalink)
£20 cheaper on ebay.
graham.webb
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Re: Battery 2021/07/21 11:27:12 (permalink)
In the end I fitted a 75Ah Yuasa. We'll see if that cranks a bit better. Interested to see they manufacture in Ebbw Vale, so that's good news...a new industry after the closure of British Steel Tinplate I expect.

Graham
'91 944 S2: Alpine white
AndrewCS
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Re: Battery 2021/07/21 12:54:01 (permalink)

Aberdeenshire (R2) : Cayman GT4 981


graham.webb
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Re: Battery 2021/07/21 13:31:34 (permalink)
Thanks for that. No cold cranking this week, haha!!

Graham
'91 944 S2: Alpine white
Waylander
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Re: Battery 2021/07/21 19:16:19 (permalink)
For starting the CCA is the most important number,
 
the AH number just denotes the amount of time it takes your battery to go flat, when you leave the lights on

1992 Cobalt Blue 968 Coupe
1986 VF1000F2 Silver
graham.webb
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Re: Battery 2021/07/22 18:24:20 (permalink)
CCA? Ah...thanks. More homework, but anyway we have new battery.
I'm aware that it's a challenge... battery at the other end of the car and cranking an oversquare high compression engine?
Disappointed to have missed Goodwood... realise that if we don't attend these things people don't organise them. Perhaps I gave up too easily, was offered the prospect of a jump start down there from a 968 friend, but couldn't risk it dying at the BP down the road!!

Graham
'91 944 S2: Alpine white
graham.webb
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Re: Battery 2021/07/22 18:31:51 (permalink)
OK. The Bosch S3 I took off was rated 640, the Yuasa is 710.

Graham
'91 944 S2: Alpine white
Waylander
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Re: Battery 2021/07/22 21:46:48 (permalink)
the charging harness can be an issue too
this is off my car today
Pictures, this is my cable off my car........................................





the black bits are pieces of the old hardened and degraded insulation, just shake the cable and it all starts falling out




1992 Cobalt Blue 968 Coupe
1986 VF1000F2 Silver
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