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Old 08-08-2013, 21:12   #31
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Re: Battery Water; Distilled Drinking Water vs. Deionized Battery Water

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Originally Posted by thinwater View Post
Did anyone actually find a specification or a standard for battery water? These standards exist for antifreeze, for example, but I could find no definitive manufacturer information or anything that gave quantitative reality to damage caused by Ca, Mg, Cl etc.
Battery manufacturers recommend distilled or RO/DI water. Low (near 0) TDS.

I suspect that a test of Distilled vs Tap Water might yield the folllowing:

Average battery life with distilled: 5 years
Average battery life with tap water: 60 months
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Old 08-08-2013, 21:36   #32
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Re: Battery Water; Distilled Drinking Water vs. Deionized Battery Water

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Originally Posted by rw58ph View Post
30+ years I been using Seattle area tap water. Battereis last on average 10 years as long as the water level is above the plates. I figure if I can drink the water that is pure enough for battereis.
That's fine in Seattle, it has the best tap water in the country. Elsewhere you need to be a lot more careful, the minerals in the water can kill a battery the second or third time you top it up.
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Old 09-08-2013, 07:21   #33
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Re: Battery Water; Distilled Drinking Water vs. Deionized Battery Water

yes. when i said municipal water i meant in the USA. Rain water collected from a clean surface is as good as any purchased water for batteries. If you are adding water often, then you may be over charging the battery and whatever water you add is the lesser problem. Drinking distilled or DI water will not harm you because of lack of minerals.
I stand with bstreep.
The location of the best municipal drinking water in the country is arguable in a different thread.
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Old 09-08-2013, 07:50   #34
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Re: Battery Water; Distilled Drinking Water vs. Deionized Battery Water

When we were cruising full time, I would take my RO water with TDS of about 200 ppm and use that as feed stock for a second pass through the watermaker. I would reduce the watermaker's high pressure pump output pressure to about 80psi (if memory serves me) IAW the operating manual. The resulting water was <5ppm which was close to the resolution of my TDS tester. My 12 Trojan T105s thrived on this water.
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