Joe,
Keep in mind that the number of cycles is dependent on the depth of discharge of that cycle. With lead acid batteries, a deep cycle battery may have a lifespan of more than 10,000 cycles with a shallow (5%) DOD, but only some hundreds of cycles of life at deeper levels (>70% DOD). I'm not sure that a constant trickle charge ages the battery any slower than repeated cycles of less than 1% DOD.
A file was posted to this group just over a week ago named "batteryLIFE.
Fair winds,
Eric
--- In electricboats@
>
> The Question:
>
> "For battery LONGEVITY, is it preferable to have the battery absorb every
> last bit of energy and sit there fully charged with an external float
> charger (set to, e.g., 13.2v at 70degF), or is simply turning off everything
> when float current gets below a certain point preferable?"
>
> > From: James Graham <osirissail@
> >
> > Battery life is measured in "cycles" not hours, days or years. Each time the
> > battery is allowed to discharge and then a battery charger kicks in to
> > re-charge the battery that is a cycle...
> > - - Constantly "on" charge battery charges not only keep the battery topped
> > off but they will provide the electricity to run the other equipment
>
> Thank you for emphasizing that the measure of longevity is "number of
> cycles", even if those cycles are extremely shallow DOD and last only a few
> seconds...
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