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Filling a marine battery

Old 01-20-2018, 01:49 PM
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Default Filling a marine battery

I would like to know if condensate from a condensing boiler drain could be used to fill a marine battery.Condensate is just like distilled water to my knowledge.
Old 01-20-2018, 01:52 PM
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Distilled water is less than $1 a gallon... Why would you even try?
Old 01-20-2018, 01:52 PM
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How large is the boiler installation? Large boilers typically have the water tested and chemically adjusted ( like a swimming pool) to control corrosion.
Old 01-20-2018, 02:38 PM
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Originally Posted by Chpsk8 View Post
Distilled water is less than $1 a gallon... Why would you even try?
My last boat had 4 golf cart batteries. I went through a gallon about every 2 years.
Old 01-20-2018, 02:40 PM
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Yes.
Old 01-20-2018, 02:47 PM
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Originally Posted by phishxxii View Post
I would like to know if condensate from a condensing boiler drain could be used to fill a marine battery.Condensate is just like distilled water to my knowledge.
I think you have been misinformed. The condensate contains nitric acid (as a result of combustion reaction with atmospheric nitrogen) and typically has a pH of 3-4.

Hardly "distilled water".
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Old 01-20-2018, 03:31 PM
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Originally Posted by Fwpratt View Post
I think you have been misinformed. The condensate contains nitric acid (as a result of combustion reaction with atmospheric nitrogen) and typically has a pH of 3-4.

Hardly "distilled water".
Like we said...when distilled water is $1 per gallon, why even bother.
Old 01-20-2018, 03:37 PM
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I wouldn’t do this , there are byproducts from combustion gasses that you don’t want in your batteries.
As stated. Depending on boiler , could be some iron in there also.
Old 01-20-2018, 08:06 PM
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Is it a trick question?
Old 01-20-2018, 08:44 PM
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I recently topped off three of mine. I went to the grocery store and bought a gallon of distilled water for 99¢
Old 01-20-2018, 09:28 PM
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I doubt if the OP is asking because he wants to save money.. I have some old batteries in my garage from the boat that still hold a charge & I use them on occasion around the house. I happened to check to see how much water I had in them & they were both low on water. I looked & couldn't find any distilled water so I used water out of the dehumidifier. This can't be much different than distilled water.... right?
Old 01-20-2018, 09:42 PM
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No. Most condensate isn't good for batteries since it usually goes through metal (lead, copper, aluminum) in the process. Distilled water does not come from moonshine-like "stills" ;-) And it picks up a lot of nasty stuff in the pipes and pans. Please don't drink it and if it isn't safe to drink....

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Old 01-21-2018, 01:43 AM
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Absolutely NO. You shouldn't use boiler condensate water for anything. It is highly corrosive.

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