Consider these signs of a failing battery:
- Each time you start the car, the headlights appear to be dimmer than the time before.
- The car horn sounds weaker than you remember it sounding.
- When you turn over the car in the morning, the engine cranks very slowly.
- There is a foul odor coming from the battery compartment.
- The interior lights are beginning to flicker when the car is running.
- Your car all of a sudden needs to be jump start more than once.
- The casing around the battery appears to be swollen and bloated.