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While you can certainly question the 12 hour number it will not do any harm to leave it on that long. (You could leave it plugged in all the time and it would not overcharge or damage the battery.) I do not believe that it is needed but what is needed is to make sure it is fully charged (which may take an hour or so past the indicator) and then discharge quite a bit to calibrate the gauge. This won't change the battery but will make the battery indicator more accurate.
Dale
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