![]() ![]() ![]() A 100AH AGM should receive no less than 20 amps and should be brought upto absorption voltage with this much current and held there until it is fully charged some 4 to 5 hours later. Some manufacturers do this to eek out a few hundredths of a MPG as it is said every 25 amps the alternator has to produce sucks up one engine HP.Ībsorption voltage, which is basically the maximum voltage the manufacturers will recommend for both, range from 14.2 to 14.9v depending on the manufacturer.Ī bigger difference with AGMS appears when they are deeply discharged. There re exceptions to the 13.6v as some vehicles want to keep the battery discharged enough that it can accept higher amperage from teh alternator when teh computer controlled voltage regulator commands it to bring system voltage into the 14's. The biggest difference in charge profiles spec'd by manufactures is float voltage.įloat is a battery charging stage designed to keep the fully charged battery, fully charged, without overcharging.įloat voltage specs for flooded batteries range from 13.01 to 13.4 voltsįloat voltage specs for AGMS range from 13.4 to 13.8vĪlmost no vehicle with a properly working charging system allows less than 13.6v anyway, so the float voltage spec is ignorable in this application. When the battery is cycled deeper, then meeting the manufacturer recommended charge profiles become more important, but a shallowly cycled AGM used as a starting battery will be fine with the voltages allowed by the vehicle, as they are hardly ideal and made for ultimate battery longevity to begin with. They are not really consequential when the battery is used as a starting battery. Regarding charge profiles and the differences between AGM and flooded, ![]()
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