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Old 10-31-2013
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Uneven Water Loss in Batteries

Hi All,

Strange questions. I keep my 343 on a battery charger (3 stage marine rated) while she's at dock. I also do monthly battery maintenance, including topping off the banks w/distilled H20 once a month.

In my most recent maintenance cycle, I noticed an oddity. My house bank is two Group 27 batteries wired in parallel. They are in battery boxes below the aft bunk which has a vent. In topping off the fluids, I noticed that 1 battery had much lower water level than the other. The other battery had water level that was full (required nothing) while the other was really low (almost to the point of showing the plates).

What could be causing this uneven water loss?
S/V Jendai
Beneteau 343
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