14. Hydrometer Testing Batteries
•Hydrometer testing can used to measure the specific gravity of deep cycle
batteries. This allows you to detect weak cells, which are causing loss of running
time. It can only detect this type problem. The hydrometer should have specific
gravity markings such as 1.265, 1.250, 1.225, and so on.
•Hydrometers with the four balls are not accurate enough for this test are not
recommended.
•Fully charged batteries should read 1.265 and will decrease as batteries are
discharged until they reach 1.120. This test should be done when batteries are
charged and cooled. Allow one hour or more to cool. It can also be done after
batteries are partially discharged, if they are allowed to cool. However, you will
not be able to detect the full capacity of the battery.
•Note: Maintenance Free batteries can not be tested with a hydrometer.
Do not attempt to remove caps or covers. This will destroy the battery.
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