Under What Circumstances Does a Car Battery Need to Be Replaced?

[RosalieLee]

Circumstances under which a car battery needs to be replaced: 1. The car is harder to start than usual, which may be a sign that the battery is about to fail; 2. The headlights dim when idling, because the engine's charging power decreases at idle, and a deteriorating battery also needs to power the car's electrical equipment, leading to a significant drop in the power allocated to the headlights; 3. The battery fault warning light comes on, requiring a check and possible replacement at a 4S shop or repair shop; 4. Unusual noises during startup: due to the weakened discharge capacity of the battery, the starter operates poorly and may produce a squeaking sound; 5. Changes in the inspection window: many maintenance-free batteries have an inspection window with a light indicating the battery's condition—green means good, black means the battery needs replacement; 6. Bulging or leakage of the battery, which should be replaced immediately.