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Specific Gravity Testing (flooded/wet batteries ONLY)
7.3.
•
Fill and drain the hydrometer 2-3 times before drawing a sample from the battery
•
Measure specific gravity readings for all battery cells
•
Correct specific gravity readings for temperature by adding 0.004 for every 10°F
(5°C) above 80°F (27°C) and subtract 0.004 for every 10°F (5°C) below 80°F (27°C)
•
If every cell in the battery set is below 1.250 the batteries may be undercharged;
recharge batteries
•
If any battery has a specific gravity variation of more than 0.050 between cells
equalize the set
•
If there is still a variation there may be a failed battery
Open Circuit Voltage Testing
7.4.
This is the least preferred method of evaluating the performance of a battery.
•
For accurate voltage readings, batteries must remain idle at least 6 hours (but
preferably up to 24 hours)
•
Measure the individual battery voltages
•
If any battery voltage is greater than 0.3V from any other battery in set, equalize the
set (flooded/wet batteries ONLY). Refer to equalizing
•
Remeasure the individual battery voltages
•
If any battery voltage is still greater than 0.3V from any other battery in set you may
have a failed battery
section 3.4.2
18
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