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post #2 of Old 09-21-2004
GordMay
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Battery Voltages vs Capacity

Open Circuit Voltage is a poor indicator of state of charge - but here’s a rule of thumb:
>12.7 V (rested) = 100%
12.5 V = 75%
12.2 V = 50%
11.9 V = -0-

Note: Recently charged batteries must have Surface Charge removed prior to OCV test. Requires a LARGE load (up to 200A) for 10 seconds or so.
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