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Originally Posted by slg
I think you'll find that battery technology hasn't changed too much over the years and that anything over 14.5V starts to over heat the battery and cause the electrolyte to "boil" off. I think you'll find that 'most' cars are actually 14.5V when tested with a quality meter.
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All the common Bosch regs regulate to 14.8 volts......
A 'Proper' 4 stage charger will run up to 16v initially to de-sulfate the battery's plates.
It's high amperage that causes electrolyte boiling not high voltage (I.e too high a charge rate = high amps).
The biggest killer of batteries these days is under bonnet heat which transfers into the batteries cells, warping the plates, and eventually causing a short (dropped cell).