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Old 05-13-2014, 12:42 PM   #1
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Testing AGM deep cycle batteries

How do you test Lifeline 8D AGM batteries to see how much life they have left?
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Old 05-13-2014, 02:46 PM   #2
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Hi pumper9x9,
This can not be done. However, one can test the batteries to determine if they are storing power and able to sustain a discharge. The batteries needs to be fully charged. The goal is to do a load test on each battery. You'll need to take the fully charged batteries to any auto parts store or purchase a load tester. My tester is rated at 130 AMPS
1. The batteries must be isolated from each other.
2. Fully charge the batteries.
3. Let them sit for a couple of hours.
4. Connect the load tester and follow the instructions. The test is usually no more than 15 seconds per battery.
5. Document the reading for each battery.
6. All the readings should be the same or very close to being the same.
7. All the readings should remain in the "green" area of the tester meter.

This will provide you a good feel for the batteries. The closer the batteries get to the "red" zone, on the meter, the closer they are to replacement.
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Old 05-13-2014, 03:05 PM   #3
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Here is a link to a youtube video series, it is lengthy but I find it quite informative.

1000Ah Battery Bank Part1 - My Salvaged $40 Battery Purchase : an Introduction - YouTube
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Old 05-14-2014, 01:32 AM   #4
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At least one auto parts store in our town will do all those battery tests for free.
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Old 05-14-2014, 06:25 AM   #5
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The problem I would have is finding a forklift to carry my AGM's. They're huge, and not something I'd try to get out of the compartment by myself.
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Old 05-14-2014, 06:46 AM   #6
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When I bought my used MH, it was the age of my batteries that made me think of replacements. I took them to the auto parts store for confirmation. My only word of advice is be aw air that the tech/sales person may not understand batteries or checkouts....my mind was already made, but the results were predictive--batteries were all dead and cannot hold a charge! But, we have some good choices for replacements.
I had priced Sam's Club and was prepared to tote the massive battery set over to them for a swap.
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Old 05-14-2014, 09:03 AM   #7
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The normal battery tests are quite good for testing starter batteries where you are mainly concerned with cranking amperes, but aren't so useful for testing house batteries where the loads are usually lower and the duration much, much longer. If a cell has failed then the load test will work, but if the battery has just gradually lost capacity, it may still be able to provide reasonable cranking performance.
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