What you guys are saying is essentially true, but saying they will "last longer" isn't technically correct in every case. It's the total number of cycles that is reduced by "deep cycling", which is not necessarily the same as total lifespan.
If the boat is only used once a week for example, the reduction in cycle-life for 80 percent discharge vs. 50 percent probably won't make much difference in the overall life span. It may reduce total cycles from perhaps 800 to 500. That's still almost ten years of weekly use, and that extra 30 percent range can be very useful.
There are a lot of other things that can kill lead-acid batteries prematurely, most commonly sulphation due to lack of use and maintenance.
If you're running a solar powered cabin or something where the batteries are cycled daily it's a different story, and that's probably where the "conventional wisdom" of limiting discharge to 50 percent comes from.
Jim
--- In electricboats@yahoogroups.com, "\"hanermo\" - CNC 6-axis Designs" <gcode.fi@...> wrote:
>
> The more you use them, the faster they wear out.
> At 80% they last a lot longer, about twice, than at 50%.
> Judgement call.
>
> Li-on can be discharged to 20% or so, for 300% more cost, and 1/3 the mass.
> Judgement call again.
>
> > i've heard that batteries can be discharged to about 50% without doing
> > any long term damage... considering that why is it that automatic
> > recharging is set to come on at 80% rather than say 60%
> >
>
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