Is it a 12v battery?

   / Is it a 12v battery? #11  
Fun fact: once a battery reaches 12.4 volts it is at only half charge.

That is correct.... only at 10* F. At 80*F a battery with a voltage measurement of 12.4 volts will be closer to 75% charged.
If you are taking a battery voltage reading to determine state of charge you must also measure ambient temperature. With these 2 pieces of data find a battery state of charge temperature correction chart on the internet to determine % of full charge.
 

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