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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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