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Battery Meter
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#2
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Battery Meter
Thank you. It's good to see a little high quality science interject
itself into an otherwise degenerating discussion. :-) All the better it supports what most of us have observed. Chuck's electrons have become damp, slugish, and not a little bit stubborn, having lived in the Pacific North West for so long. Steve's hypothesis states that once the battery has achieved a full charge of 2.2 volts per cell, the decrease to 2.1 is due to an a change in the chemical concentration within the cell. Very probable scenario. Doesn't support any sort of position that the battery was never charged to 13.2, though, does it? Merely explains with greater technical clarity than the term "self discharge" why the voltage will eventually drop. And that's the Pacific North WET, thank you very much. :-) |
#3
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#4
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Battery Meter
"Steven Shelikoff" wrote in message ... a bunch of good stuff related to batteries... I guess that's why they call them 12 volt batteries instead of 13 volt batteries, huh? Eisboch |
#5
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Battery Meter
It may have been charged at 13.2, to 13.2, or whatever you want to call
it. But if you're taking the measurement right after charging, you're reading an artificially high voltage. No, there's nothing "artificial" about it. That's the voltage reading at the time a battery finishes charging. As others have said, (quoting various time periods from "almost right away" to "overnight") the voltage eventually drops to a lower point. If you've got a $3000 paycheck, spend $200 on the way home from work and only have $2800 with which to pay your bills, would that mean that you *never* had $3000? If you put the battery to work as soon as it has recharged to full capacity and before it undergoes the internal changes that lower the voltage, you can take advantage of (some of) the additional voltage. A battery that cannot be brought to a point above 12.6 when charging, considering the benefits of the internal heat and the concentration of chemicals on the plates, is not in good shape. What would happen to the battery that barely charges to 12.6? It will also cool down, the chemicals will also equalize, etc.......leaving you with what? 12.1? 12.2? If we are going to apply the "battery cools down and chemicals equalize after charging" caveat to the battery charged to 2.2 volts per cell, it must also be applied to batteries charged to only 2.1. |
#6
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Battery Meter
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