Quote:
Originally Posted by humfrz
The liquid that is already in the battery is mostly water.
So, a little "top off" of demineralized or distilled water won't hurt anything...... because what went away was water ..... not the acid.
humfrz
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Except for the time issue. Just as you can add water to cooling systems you can add water to batteries. However, to gain freeze protection the water must have a chance to mix with the "antifreeze". In the case of coolant the water needs to mix with the existing glycol mixture. This happens rapidly. With batteries it needs to mix with the sulfuric acid mixture. That takes quite awhile. Do not top up your battery in freezing weather, it can bust the case.
In reality, low maintenance batteries are worn out by the time they need water. Just replace it.