Battery Full

[agallant80]

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)

 

[Moody Blue]

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]

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.

 

[MH Hawker]

Re: Battery Full

Some thing like this.

 

[tazrig]

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.