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Old 08-20-2021, 04:36 PM   #1
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Exclamation Could it be something other than needing a new marine battery?

I have a Coachman motorhome that is 4 years old. I always keep it plugged into a power source. When I am either plugged in or driving, I have a full 12 volt charge. Soon after unplugging, my charge drops to nothing. I'm guessing this means I need a new marine battery, but does anyone have a suggestion on something I should check before replacing the battery. Thank you.
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Old 08-20-2021, 05:10 PM   #2
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Have the battery load tested. ( After charging ) It will either fail or you have a electrical draw in the system. causing it to go dead. ( if it has been drawn down to dead several times it is also toast )
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Old 08-21-2021, 05:45 AM   #3
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Charging just means the battery was supplied with electricity, but it doesn't mean the battery did anything with it. Like a glass you are filling with water, if it has a hole in it, no water will remain. Are the batteries flooded cell? When was there last time you checked the water in them? Is there corrosion on the battery connectors? A load test is not putting a voltmeter on the terminals so make sure you did a real load test.
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Old 08-21-2021, 07:41 AM   #4
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Choosing An RV Battery

Choosing An RV Battery
This is a good article, but its recommendations against “Marine Batteries” does not apply to “Marine AGM batteries”.

Battery University

How does the Lead Acid Battery Work?

How do battery chargers work

How to Charge and When to Charge?
Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
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Old 08-23-2021, 05:27 PM   #5
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I will check those things and I appreciate your help.
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Old 08-23-2021, 07:02 PM   #6
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Dead battery

So depending on how long your rig is plugged in if your charger is a consistant say 14 volts it could be there is no water left in the cells. My house batterys are A wet style, after a couple months i have to add water. Overcharging batteries are just as bad as undercharging in many ways. If you continue to leave the rig plugged in it would be good to check that the charger not “cooking” the cells using a voltmeter .
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