Can the Battery of a Flooded Car Still Be Used?
2 Answers
It can be used normally. This is because the battery internally relies on distilled water for operation. Even if water enters, it can still function as usual. Some batteries may experience reduced storage capacity due to a lack of distilled water, but adding ordinary water can still make them work. Even if submerged in water for about half an hour, there won't be any issues. However, prolonged exposure does carry certain risks. If it exceeds the tolerable limits, the "three-electric" system may be damaged, leading to unimaginable consequences. In such cases, it's crucial to seek professional help immediately. Below is some relevant knowledge about water entering the battery: 1. In the electrical circuit system of an electric vehicle, the "low-voltage system," which is similar to that of traditional fuel vehicles, does not have sustainable water-wading capability, with a waterproof rating ≤ IPX5. If wires or the ECU are submerged in water for a period, water ingress may occur, causing a short circuit in the low-voltage circuit. 2. Taking the example of the vehicle's computer getting wet, although a short circuit in the low-voltage system due to water ingress won't cause electric shock injuries to personnel, it can render the vehicle undrivable.
Water-damaged car batteries are generally unusable. In my many years of auto repair, I've commonly seen batteries short-circuit internally or suffer from electrolyte contamination after water exposure, rendering them completely useless. Water can damage the lead plate structure, causing corrosion and even posing a fire hazard. I once encountered a car owner who attempted to power test it themselves, resulting in the battery smoking – a serious situation not to be taken lightly. During inspection, avoid tampering with the negative terminal; first disconnect it and let professionals test with proper tools. If the voltage is abnormally low or the casing is damaged, replacing the battery is mandatory – don't skimp on safety for minor savings. By the way, regularly check battery sealing during maintenance, especially applying waterproof treatments before rainy seasons to prevent issues proactively, saving both money and hassle. Water-damaged vehicles are troublesome overall, with batteries being just the tip of the iceberg – prompt professional handling is the correct approach.
