Join Date: May 2009
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As the others said, add distilled water ONLY.
Battery electrolyte should be maintained at 65% water and 35% sulphuric acid. When the water evaporates, it leaves a greater concentration of acid, so if you add more electrolyte, the percentage is upset and the battery will not function correctly.
The only time you should add electrolyte is to a brand new battery that has never been filled before.
It's actually my sister's, but I'm the family wrench.