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Old 10-28-2011, 03:12 PM   #11
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Join Date: Feb 2011
Location: SW Ontario
Posts: 1,385
Originally Posted by Lady Fitzgerald View Post
Snip.......However, I have had batteries show full voltage at rest but drop dramatically when a light to medium load was placed on them (usually, an open or high resistance internal connection is to blame). Even a partial charge (usually what is called a surface charge) can show full voltage but, when loaded, will discharge rapidly. The only way to accurately check a battery with a meter is to put a load on it. Even a hydrometer test will can be invalid if the battery has an open or high resistance connection that allowed a trickle of current in to charge the battery.
I agree with Jeannie 100%.
To really know the condition of the battery, do a hydrometer test of each individual cell, then measure the battery voltage under a small load with an accurate voltmeter. At full charge with no load, it will measure 12.7 volts, and discharged under load will measure about 10.5 to 11.0 volts, for a 6-cell lead acid battery.

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