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Old 09-17-2020, 08:38 AM
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andrewwynn andrewwynn is offline
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Location: Racine, WI
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Quick question about BATTERY VOLTAGE !!

For a 12v battery to show 12.2 to 12.4
Is very normal. Old or new. The resting voltage is based on the chemical reaction that develops just over 2.0v per 6 cells.

The 13.6ish really should not be called battery voltage though we all.say that it's the alternator output voltage happens to be connected to the battery terminal. The 13.6-8 number must have been decided as a good value to supply a decent amount of charge to the battery without over charging it.

Some newer cars will disconnect the battery from the charging circuit so they cant over charge.
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