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Posted by m Ransley on August 6, 2004, 4:04 pm
 If I have a battery operated sump pump with a deep cycle marine battery
on a float charger and it is not used how long will my battery remain
good , or at 90 % life . 10 yrs ? 20 yrs? 30+ yrs ?

Posted by Ron Rosenfeld on August 6, 2004, 6:18 pm
On Fri, 6 Aug 2004 11:04:21 -0500, ransley@webtv.net (m Ransley) wrote:

That is dependent on the battery.  The manufacturer will have an answer.

If you do nothing other than what you describe, eventually the electrolyte
level will get below the plates; the plates will warp and the battery will
die.  That will be true for most lead-acid deep discharge batteries.  Life
span would likely be less than a year.

If you have something like a Surrette 8CS25P, and you float it at the
correct voltage; check the electrolyte level at appropriate intervals; and
perform an equalizing charge every six months or when needed, the battery
should last at least ten years, and probably quite a bit longer -- perhaps
double that.


Posted by Bill Darden on August 6, 2004, 6:33 pm
 It depends on the plate chemistry, preventive maintenance and charging
voltages.  Please see Section 11 in the Car and Deep Cycle Battery FAQ
on www.batteryfaq.org for table on  expected battery service life.

Kindest regards,


On Fri, 6 Aug 2004 11:04:21 -0500, ransley@webtv.net (m Ransley)

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