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Old 6th February 2018, 03:56 PM
North2007 North2007 is offline
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Default Battery Cranking Volts

My car is showing 9.6 volts on cranking, its been slow to start after 4-5 days of not been driven. New battery last year, itís a 95Ah 800A not the stronger 110 or 120. Would this make a difference?
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Old 7th February 2018, 03:40 AM
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27litres 27litres is offline
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CCA rating is more important than the Ah rating, though a higher Ah rating means it has "more to give" so to speak.
A voltage drop during crank is to be expected, as the battery is having the oomph pulled out of it.
I've never measured one to see if 9.6 is a standard voltage or not.

One thing I have learner over the years though is that you should never under rate a battery for a diesel below that of OEM.
In order to start the car, a smaller capacity battery will have more pulled out of it in comparison to a larger capacity battery, meaning the recovery time (as in charging) is higher.
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Old 7th February 2018, 07:06 AM
North2007 North2007 is offline
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Thanks Marty, I read if it falls below 10 volts while cranking, the battery is on its way out.
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