Filling batteries with distilled water is easy enough on say, a car, which has only one battery with six caps. Doing it on a boat that has ten batteries and a total of 48 caps, all deep within the bilge is a very different matter. It used to take me about two hours to test then fill them with water using a funnel and a jug.
I now use a product that does it automatically using pipes and special replacement caps. Now it takes ten minutes and I don’t even get my hand dirty. If your boat has multiple batteries in an inaccessible place, you need to look at this superb idea.

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