Re: (ET) Deep Cycle Battery Question

["Hazen, Dwight L" <hazen indiana edu>]

Or just use your tractor and the day it no longer has the capacity to do
what needs to be done, get new batteries. Getting my yard mowed on a
single charge is my battery test.  

 Dwight


-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of David Roden
Sent: Thursday, June 29, 2006 11:39 AM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Deep Cycle Battery Question

A hydrometer applied to a fully charged, well-equalized battery will
tell 
you how far sulfation has progressed with that battery.  But there are
other 
aging mechanisms which it won't detect or measure.  

The original post is on the right track.  The most useful test for a
battery 
is a capacity test, since that's what we really care about anyway.
Charge 
it fully, apply a known load (preferably a constant current load), and
time 
how long it takes to drop to 5.25 volts (6v) or 10.5 volts (12v) while
under 
load.


David Roden - Akron, Ohio, USA

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