Quote:
Originally Posted by Chris R
The date on my 6v Interstate batteries is 2014, started to be used late 2015, now 6+ years old. They are maintained and connected to solar.
They have been disconnected for a few days while doing other work, so I measured them using a voltmeter they are 12.65 volts. Some charts say this is close to 100%, Trojan chart shows about 90% and others show 60%.
I know they are getting tired, due to replace, not sure yet. Does anybody have advice on what 12.65 really means?
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My bet is you have some more life in them. I'd be interested in what a
hydrometer tells you. The specific gravity of the electrolyte in each cell will tell you more than just a voltmeter and you can see if there are any significant differences between the cells. Also I never thought about this until now but you should be able to put the batteries under a load test like the auto shops do to a suspect car battery. Harbor Freight makes a
unit that also tests 6V batteries.