Can I add purified water to the battery?

1 Answers
Duncan
07/29/25 8:49pm
If the battery is a water-based battery, purified water can be added. However, if the battery is maintenance-free, purified water must not be added. Electric vehicle batteries use a lean electrolyte design. During daily charging, gas evolution occurs in the battery, causing the water content in the electrolyte to gradually decrease, the sulfuric acid concentration in the electrolyte to increase, and the corrosion rate of the battery plates to accelerate, thereby affecting the battery's lifespan. Check the battery for water shortage approximately every six months. If water shortage is found, replenish distilled water promptly. Distilled water is formed by the condensation of gas and contains fewer impurities. If distilled water is unavailable, consider using purified water, as it contains some substances harmful to the battery.
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