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Battery

graham.webb

graham.webb

PCGB Member
Member
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?
 
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.

 
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.

 
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

 
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!!

 
the charging harness can be an issue too

this is off my car today

Pictures, this is my cable off my car........................................

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IMG_1226.jpg
IMG_1227.jpg


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

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