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Very much appreciate your taking time to comment.
For me, this was mostly a question about practical use for an improvement in an old technology. If of interest, my specific vehicle which was for many years a 150km daily commuter car, no longer achieves that distance in one month. The well-exercised batteries did last longer, but with current usage, a battery never quite approaches a full charge.
Marketing certainly adds confusion. Virtually all (re-branded) batteries here are made by 3 manufacturers. Most sellers offer a Good-Better-Best sequence of increasing listed CCA, increasingly long warranty, and increasing price. (Some suspect they are the same battery and the offered warranty-length determines the selling price.)
As an example, my (BCI) battery size is 51R. It matches size code 053 (238mmLx129Wx223mmH) in a UK list, but those appear rated low at 380 CCA.
At the only local nationwide-chain parts store, the EFB version is sold for 10-15% more than the standard 500 CCA battery. Automobile-dealer parts-departments price the standard flooded about 10% higher than that.
Perhaps I am spending a bit too much time thinking about "value" in this case - about half the members at my usual online auto forum declare they simply replace the starter-battery every 3 years as routine maintenance.
For what it's worth, so far EFBs here (Exide) are being priced for retail sale nearly the same as AGMs. A competing manufacturer (Clarios) which certainly sells EFBs (at least to auto-makers), on their website touts AGMs as far superior. Perhaps older vehicles will keep to standard lead-acid, and EFBs are destined go the way of Betamax...
Edited by Ron Griffin on 10/04/2024 at 09:17
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