Battery Full

A

agallant80

Commander
Joined
Oct 25, 2010
Messages
2,328
Can anyone smarter than me give me a general idea of charge resting to 4/4 3/4 2/4 1/4 (Empty to full)
 
M

Moody Blue

Captain
Joined
May 24, 2004
Messages
3,136
Re: Battery Full

Is this what you are asking?

12.60 V 100%
12.35 V 75%
12.10 V 50%
11.95 V 25%
11.70 V 0%

as posted on Wikipedia.
 
bruceb58

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,478
Re: Battery Full

Make sure you take your voltage reading about 30 minutes after you take the charger off or stop your engine or you will be measuring a surface charge.
 
tazrig

tazrig

Lieutenant Commander
Joined
Dec 20, 2012
Messages
1,752
Re: Battery Full

It would also depend on the type of battery you have. For example the above numbers are for a standard or deep cycle flooded battery. If you have an AGM battery the numbers would look like this:

Full state of charge = 12.84v or higher
3/4 state of charge = 12.5v
1/2 state of charge = 12.2v
1/4 state of charge = 11.9v

source: Odyssey AGM Marine Battery Manual

I'm not quite sure why the numbers are different, possibly because there are more lead plates packed into an AGM than a conventional flooded battery.
 
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