Can a swollen battery still be used?

[OTimothy]

A swollen battery cannot be used. The reasons for the swelling are: 1. The charger used does not match the battery's parameters, or the charging voltage is too high due to aging of the charger or wiring, causing parameter drift during charging; 2. Sulfation of the battery caused by high-current discharge, deep discharge, frequent discharge, failure to charge in time, or insufficient charging time, leading to battery bloating; 3. Malfunction of the battery's safety valve. The safety valve in the discharge circuit automatically opens to release pressure when the internal pressure of the battery rises, ensuring normal battery use. If the safety valve fails to open when the battery's pressure rises, it results in battery swelling.

[StDallas]

My old car battery has bulged multiple times, each time making my heart race. I sincerely advise against continuing to use it. Bulging indicates internal short circuits or overcharging, with gas accumulation causing the casing to expand. If you still force-start it, there's a high risk of acid leakage corroding the chassis or even causing an explosion, especially during hot summer temperatures. Once, I tried to save money by using it for two more weeks, only to experience weak starts and damage to other circuits, ultimately costing me over a thousand more for a new battery. Safety is paramount—I immediately drove to a professional repair shop for inspection, where the mechanic confirmed unstable voltage and insisted on replacement. Regularly check if the charging system is functioning properly to prevent overcharging and premature aging of the battery.

[DeJoel]

Previously, my van's battery swelled up, and I stubbornly kept using it for months—what a terrible decision. At first, it could still start the engine, but later, even morning starts became a struggle. I had to push the car multiple times and borrow power from others, which was exhausting. In summer, it got even worse—the battery overheated badly and almost burned my hand. Thankfully, it didn’t explode. Experience taught me that after swelling, performance drops rapidly, and it might even affect the alternator or wiring. Don’t wait until it completely dies to replace it. Now I’ve learned my lesson—I regularly check the battery’s condition with a voltmeter and replace it immediately if any abnormalities are found to avoid trouble.

[DelBeau]

A swollen battery might barely start the car, but the cost is too high to be worth it. I once tried to save money by continuing to use one, only to have it completely fail two weeks later, forcing me to pay for towing and a new battery. In the end, the losses exceeded the cost of a direct replacement—a new battery only costs a few hundred bucks and lasts for years. Unstable performance could leave you stranded on the road, affecting work or picking up kids, and repair labor isn't cheap either. It's best to stop using it immediately and get it checked. If the swelling is minor, you might still recycle it for some cash, but don't attempt to start the car again.

[Phoebe]

A swollen battery is usually caused by the decomposition of internal electrolyte producing hydrogen gas, leading to expansion and deformation of the casing, indicating aging and damage. I often work on cars in the garage, and in such cases, the current output becomes unstable and prone to short circuits, causing voltage fluctuations that can damage other equipment. It is not recommended to use it because of the high risk of acid leakage, which can corrode vehicle components. Before replacing it, you can test the voltage—if it's below 12V, it's no longer usable.

[DeMarcus]

The battery in my car is swollen, and my wife urged me to deal with it and not take the risk of using it. It is indeed unsafe and may cause a fire, affecting the whole family's travel plans, so I quickly replaced it with a new one. Prevention is crucial in daily life—check the charger to avoid overcharging, keep the battery clean, and prevent exposure to high temperatures. If the swelling is minor, stop using it and recycle it properly; do not start the car to avoid further damage. Choosing a reputable brand can extend its lifespan.