What are the signs of a bad car battery?
1 Answers
Here are the signs of a bad car battery: 1. Difficulty starting the car: If the car suddenly becomes difficult to start without other factors, it may be a sign that the battery is about to fail. 2. Dimming lights at idle: For example, when waiting at a red light or temporarily parked, the headlights suddenly dim because the engine's charging power decreases at idle. 3. Battery warning light on: When the battery warning light comes on, it reminds the owner to go to a repair shop for battery maintenance and testing. 4. Unusual noises during startup: Due to the weakened discharge capacity of the battery, the starter may operate poorly and produce a squeaking sound, which is particularly noticeable in low temperatures. 5. Battery inspection hole: Maintenance-free batteries have an inspection hole. The light in the inspection hole indicates whether the battery is working well—green means good, and black means the battery needs to be replaced. 6. Bulging or leaking battery: This mainly checks whether the battery is bulging or leaking. If such conditions are found, replace the battery promptly. 7. Voltage changes before and after startup: The normal working voltage of a battery is around 12V. After startup, the generator charges the battery, and the voltage rises to about 13-14V. Many cars have a voltage check function, allowing you to monitor voltage changes before and after startup to determine the battery's condition.
