In article ,
Michael A. Terrell wrote:
Very few car batteries are given an amp our rating in the US since
they are not used without a charging circuit.

Great. So never used with the engine stopped? All car batteries in the UK
have the amp.hour marked on them. As well as max current, etc.

I have an electronic battery tester - an expensive device. This gives a
instantaneous readout of the capacity in amp.hours. If you don't know what
it should be it is fairly useless.

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*I brake for no apparent reason.

Dave Plowman London SW
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