A fully charged 12 volt flooed-lead-acid battery - when it is at its highest capacity - has 2.15 volts per cell. Not 2.09 volts. An absorbed glass matt battery near the same.
A fully discharged 12 volt FLA battery has 1.9 volts per cell.
You check battery voltage at the battery when it's been at rest for awhile. Not right after cranking or charging. Finding a battery reading 11.9 volts right after cranking means little. If you come back 15 minutes later and it still reads 11.9, it's almost completely discharged (or defective).
A healthy 12 volt battery if sized correctly will drop to 9 - 9 1/2 volts when cranking the engine over. If it drops below 9, there is a problem - e.g. a bad battery, bad wiring, bad starter, engine problem, etc.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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