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Old 06-15-2013, 10:51 AM   #1
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New batteries - should be fully charged?

Hi all,
One of my 12V batteries is dead (been tested and all). I've read a ton on this forum and others about replacing 12V together (in addition to 6v series vs 12v parallel). I will do that, not a problem - i'd prefer to start fresh.

My question, and forgive me if it is on here somewhere, what should i expect in terms of voltage from two 'new' 12v batteries? I guess I'm really asking how discharged should new batteries be and should I throw them on my battery tender before I use them on the trailer? Guess I'm trying to make sure I don't buy duds?

Thanks all!

Jason
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Old 06-15-2013, 10:54 AM   #2
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They don't usually come fully charged since they sit on the shelf for a few months and most stores don't do anything to them. They are probably around 50%-70% charged. Check the electrolyte levels and definitely charge them before use. If you can, check the date codes and get the freshest batteries you can.
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Old 06-15-2013, 11:02 AM   #3
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Thanks, Bartlett. I'll take my voltmeter with me and look for the freshest date.

Jason
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Old 06-17-2013, 08:52 AM   #4
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Like said before, they are charged initially but left to sit on a shelf, so they lose some charge over time even being brand new.

Rule of thumb is:
12.9-13.1V = 100% Capacity
12.6v-12.9V = 75% Capacity
12.4-12.6V = 50% capacity
12.2-12.4V = 25% Capacity
<12.2v = Shorted, or battery should be replaced for certain.

These voltages are measured after the battery is fully charged, taken off the charger and rested for 12 hours.
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