Re: (ET) Deep Cycle Battery Question

["David Roden" <etpost drmm net>]

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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