Join Date: Sep 2006
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Re: 13 plus volts on rested battery?
It is notoroiusly difficult to judge a battery condition by measuring the battery voltage, unless the battery is completely dead at (like) 12V or something similar.
Over the years, I have found that the only test is to charge it up, and work it to see if it meets a reasonable load, then re-charge it and see if it holds charge.
When your motor is charging, the battery voltage should be at about 14.1 V (or near to).