I can understand the confusion. A 12 volt battery with 12.6v open circuit voltage is considered to be fully charged, but it is in what is a nominal 14 volt system. Each cell on auto and commercial lead and free acid battery produces 2.1 volts. Any 12v. battery that has a OCV of less than 10 volts or more than 11v. is potentially only discharged. Between 10 & 11v. the battery probably has a dead cell.
Count the cells and you will know the voltage of the battery. A battery with 12 cells is said to be a 24v battery but needs to have 25.2v OCV to be fully charged. 3 cells and it is a 6v fully charged at 6.3v. OCV.
Todays computerized testers check the internal impedance of the battery and are generally very accurate.
Yes, there are batteries out there with voltage but no amps. Put 8 AAA dry cells in series and it will read 12v+ but won't start your tractor. Auto Zone normally has the very best test equipment BUT many of their employees have no clue how to use it.
Finally, there is no such thing as a "maintenance free" battery. They are maintenance impossible and only produced because there are way too many lawyers in this country.
email me if you have a question... 20 years in the battery business and I still don't know very much but will share what I do know.
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