Can a swollen car battery still be used?
3 Answers
A swollen battery should not be used anymore, as the swelling not only indicates power leakage but is also harmful to the human body. Here is some extended information about car batteries: 1. Working principle: The principle is to convert chemical energy into electrical energy. The commonly referred-to battery is a lead-acid battery. 2. Maintenance methods: (1) Do not leave the car unused for a long time: If the car is not used for an extended period, the battery cable should be disconnected, or the vehicle should be started and driven for several dozen kilometers every two weeks to ensure the battery remains functional. (2) Do not use in-car electrical equipment for extended periods while the engine is off. (3) Avoid starting the vehicle repeatedly without intervals.
The swollen battery might still work for a few days, but it's too risky. When I worked in auto repair, I saw many cases like this. Battery bulging is mainly caused by internal short circuits or overcharging, leading to gas buildup and expansion. Over time, it may leak acid and corrode the engine compartment, or worse, explode and catch fire under high temperatures. If you're in a hurry, it might work for an emergency start, but don't use it long-term—otherwise, you could end up stranded on the road. I recommend getting it checked and replaced at a professional shop as soon as possible. A swollen battery is a sign of aging, and their typical lifespan is 3-5 years. Don’t delay to save money and end up with bigger problems. During regular maintenance, remember to check the battery’s voltage and appearance to avoid accelerated aging from low charge or high temperatures.
I used a swollen battery in this car. At first, it could still start the engine, and everything seemed fine for two or three days. I thought I could save some money. But one morning, it wouldn't start, and I had to call a tow truck to replace the battery, which ended up costing more money and causing inconvenience. Battery swelling is mostly caused by significant temperature changes or unstable charging, leading to irreversible internal damage. Forcing it to work will only worsen the problem. If it leaks and corrodes the wiring, the repair cost would be even higher. After learning my lesson, I insist on checking the battery health once a year. Replacing it costs just a few hundred bucks, which is much better than breaking down on the road. Safety comes first when driving—don't cut corners for a little convenience.
