Question

why is distilled water used in the batteries and not the tap water

Answer 1

Inverter battery has two types of forms one is flat plate and second is tubular. In flat plate inverter battery, internal plates are covered with water, which makes it work. During operation, water goes through chemical reaction and breaks down into hydrogen and oxygen gas. These gases evaporate from battery and with time water level drops. This way plates remain no longer covered with water. In order to keep the battery perform efficiently, it is important to top it up with distilled water. Same process is work for tubular batteries. That's why we use distilled water in batteries.

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Answer 2

Answer:

Using distilled or deionized water is recommend because it is free from additional minerals you would find in water such as regular tap water. Adding chemicals and minerals can significantly decrease the life of batteries. ... Never add additional acid or electrolyte solution, this can also diminish the battery life.