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Old 09-28-2013, 08:28 PM   #1
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Low water in batteries

I recently noticed that my motorhome batteries were not holding a charge for very long. Checked the water and found that all 4 batteries had the water level well below the plates. I refilled the batteries today. Are my batteries toast or will they recover?

2004 Thor Mandalay 38B
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Old 09-28-2013, 08:38 PM   #2
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A lot depends on how low , below the top of the plates the level was and how heavily they were charged while low; possible deformed plates due to heat. Slow charge for 48 hrs then disconnect, from charger and loads, for 24 hrs and test voltages.
6volt in good condition should test at 6.3 v approx. If one checks out bad , below 6v, replace all 4 .
If they are 12v batteries they should check in at 12.4 to 12.5 under 12 replace.

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Old 09-28-2013, 08:43 PM   #3
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Toasted? Maybe, maybe not. Fill them up, charge them up, and monitor performance.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
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Old 09-28-2013, 09:00 PM   #4
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Another question. When was the last time you checked the water level in those B's?? If you simply neglected them that's one answer. If you did that may or will do the plates harm. As mentioned leaving them uncovered and for a time period will hurt their ability to recharge. You will determine if you did harm to the plates after you follow the suggestions above.

If you checked the water 3-6 weeks ago or even a little longer and it was OK but now it's not then maybe you have an overcharging situation. That can be checked and must be so you don't loose the water again due to overcharging.

TeJay (Tim) Auto Instructor 35 yrs (4-yrs USAF) Liz: RN/ WBGO 2014 Vista 30T/ F-53/ CHF/5-Star/Koni/Centramatics * Bella- Golden/Cocker mix & Louie-The cat / All Retired
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Old 09-28-2013, 09:09 PM   #5
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Not uncommon at all, especially if you have solar panels in the direct sunlight. I check mine about every 3 months, and will have to add water. I also think evaporation is part of it since they are not sealed. JMHO.
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Old 09-29-2013, 07:44 PM   #6
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And I hope you used distilled water, or maybe reverse osmosis purified water. You don't want any mineral ions in the water you add to a battery cause even a small amount can shorten its life.

Gary Brinck
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batteries, water

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