How Much Distilled Water Should Be In A Battery. Fill a beaker half full of water. Just remember that the battery acidelectrolyte is composed basically of 75 distilled water and 25 sulfuric acid.

The car battery contains at least 30 to 50 percent of sulfuric acid in water with 29 of sulfuric acid. It also supplies the sulfate ions required for the liberation of oxygen molecules into solution. Let the charging continue for about an hour or more.
The car battery contains at least 30 to 50 percent of sulfuric acid in water with 29 of sulfuric acid.
The distilled water will bubble when the battery attains full charge and might overflow. Tap water contains minerals that are harmful to batteries even if added in small amounts. Reenergize the battery charging system. When the battery heats up or goes through a thorough charging it will naturally lose some water due to evaporation.
