Why distilled water is used in battery?
Right then. You use distilled water because it's completely pure H2O. Your regular tap water is full of minerals and other impurities. These minerals can build up on the battery's internal lead plates, messing with the chemical reaction. This reduces the battery's ability to hold a charge and seriously shortens its lifespan. Using only distilled water keeps the chemistry clean and ensures your battery lasts as long as it should. It's cheap insurance, mate.
Distilled water is used in batteries because it’s free from minerals and impurities. If you use tap water, minerals like calcium, magnesium, or iron can react with battery acid and damage the plates. That reduces battery life. Distilled water ensures only pure H₂O is added, maintaining electrolyte balance and preventing unwanted chemical reactions.
Batteries, especially lead-acid ones, need water to maintain the electrolyte level. Distilled water is chosen because it doesn’t contain dissolved salts. Normal water would deposit salts inside the battery, leading to poor performance.
In simple words: distilled water keeps the battery healthy. It avoids contamination, corrosion, and buildup of deposits. That’s why mechanics always warn against adding tap water.
Technical reason: lead-acid battery electrolyte = sulfuric acid + water. If you add impure water, ions interfere with reactions. Distilled water prevents that, ensuring efficiency and longevity.