TwinTurbo.NET: Nissan 300ZX forum - You've not seen many batteries then
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Subject You've not seen many batteries then
     
Posted by Broke_as_**** on July 12, 2011 at 10:44 PM
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In Reply To Re: Do you have a multimeter? posted by supermario680 on July 11, 2011 at 11:49 AM
     
Message [ http://en.wikipedia.org/wiki/Automotive_battery#Terminal_voltage ]

The reason it's not a "13 volt battery" is the same that your alternator isn't called a "14 volt charging system". Batteries are usually designated by their total cell voltage at full charge and rounded to the nearest convenient number, which is not necessarily what the operating voltage at the terminals will be at any given time. Here are some pictures to demonstrate this, taken immediately after shutting the car off and forty minutes later:


     
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