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Originally Posted by humfrz

Well, now, @Gforce ...... I think you are splitting molecules here. Yes, the specific gravity of sulfuric acid is higher that that of water and in a weakly charged battery, acid stratification can take place.

However, in a healthy battery (fully charged), since the added water is soluble in the existing acid/water electrolyte solution, and the amount of water added is usually relatively small, and a battery in a car usually gets jostled around, thus mixing the added water to the electrolyte ..... the chances of the added water freezing and busting open the case are very small.

Besides, I've been adding water to batteries in the wintertime (living in OH, MO, CT and Europe) for the past 65 years and never have had a battery freeze and bust open.




humfrz

65 yrs?