Hey good Neighbor, fun post....... You state as follows....
'So voltage doesn't always tell you to condition of a battery, especially if you just charged it.' YES YOU'RE EXACTLY RIGHT
GOOD QUESTION George, the answer is NOOOOOOOOO (but you already knew that Im sure) FYI A battery experiences voltage RISE under charge but voltage SAG under a load....... Voltage alone can provide a somewhat fairly accurate, albeit not perfect, indication of its State of Charge (SOC) BUT ONLY ONCE ITS AT REST AND STABILIZED. Here's a chart I found but I cant guarantee its accuracy
In my battery testing arsenal I have a Voltmeter,,,,,,,,,,,Hydrometer (for wet FLA),,,,,,,,,,Load Tester. Using the combination OF ALL THREE one can arrive at a decent 'approximation' of the state of a battery.
I agree with you VOLTAGE ALONE DOES NOTTTTTTTTTTTTT tell the whole story but it needs to be AT REST AND STABILIZED for darn sure !!!!
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Today's Featured Article - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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