Filling batteries with distilled water is easy enough on say, a car, but doing it on a boat that has ten batteries and a total of 48 caps, all mounted 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 semi-automatically using pipes and special replacement caps and it takes ten minutes.
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TOP UP YOUR BATTERIES - THE EASY WAY.
Without even touching them