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Old 09-17-2017, 09:43 AM   #1
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Check each battery in 4 battery bank

My float charge in my 4 each 6 volt system has increased from 3.7 to 4.1. I suspect I may have a bad cell or battery in the bank.

I want to check the voltage of each individual battery after no draw or charging for 24 hours. Can I isolate each battery by simply removing the ground of each battery before testing?
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Old 09-17-2017, 09:49 AM   #2
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Yes, that should work as long as your test leads are only connected to the two battery posts on the battery being tested.
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Old 09-17-2017, 12:48 PM   #3
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Using a volt meter from pos to neg each battery. You don't need to disconnect anything except the loads, and charging.
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Old 09-17-2017, 12:56 PM   #4
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better to check the specific gravity of each cell. that will tell which cell and which battery is defective. make sure the surface of the batteries are clean as current will be lost over the face of a dirty battery.
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Old 09-17-2017, 02:35 PM   #5
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Remove one and of each jumper. That isolates all four batteries.
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Old 09-19-2017, 07:37 AM   #6
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Disconnected the + to - cables and checked each. Found the the weak one.

Thanks to all for your advice.
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Old 09-19-2017, 08:55 AM   #7
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If you found one weak one, you should absolutely replace the other in the series set. If not, the new one may not charge correctly.

It is also recommended that all be replaced, being all are the same age and have done the same work.
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