Also, the acid is what makes the battery work, the water is just a medium to carry it. Water evaporates and is also broken down into oxygen and hydrogen through the electrolysis action of charging and discharging so it is normal for it to vary. Most batteries today are shipped wet and the extra level is there to allow for some loss of water without uncovering the plates.
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1978 39 FT. Newell Classic
Jeff & Leann Shackly
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