The best measurement for state of charge is with hydrometer - no doubt about it.
The best test of capacity is a test discharge. PITA takes 4 hours to do but that is the best way to go.
I also like the 25 A discharge done for several minutes. If battery (nominal 12 V) volt stays above 10.5 then should be good. Not the best test but fairly quick and weeds out a bad battery pretty quick.
Dan Bentler
Last edited by leitmotif; 05/19/2013 11:10 AM.
