Can tap water to used to refill batteries?
Use only distilled, deionized or demineralized water to replace the lost water in batteries. This is because using tap or reverse osmosis water from residential systems can produce calcium or magnesium sulfate crystals that can fill the pores and coat the plates. Wet batteries will have a longer service life if you do not use tap water. If the plates are not covered and distilled water is not available, use rain or tap water to prevent sulfation and internal battery explosions.
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