Why Is There Water in a Car Battery?

1 Answers
McMichael
07/30/25 6:24am
Car batteries contain water due to prolonged storage or extended use. Here are the detailed explanations: 1. Electrolyte corrosion: The electrolyte inside the battery (paste-like electrolyte) corrodes the battery casing. Once the casing is corroded through, the electrolyte leaks out. 2. Electrolyte dilution: The paste-like electrolyte absorbs moisture from the air, causing it to thin into a watery state. This electrolyte is highly corrosive to metals, so components like the negative terminal spring, positive terminal contact, and even circuit board devices can be damaged. Note: When the battery is fully discharged or left unused for a long time, the dry battery should be promptly removed to prevent component damage.
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