Here are some signs that your car battery might be dying:
Slow engine crank: The engine might take longer to start or crank more slowly than usual.
Check engine light: The check engine light can indicate a number of issues, including a low battery.
Battery corrosion: The battery terminals may be covered in a blue-green powder or flaky residue.
Cleaning the terminals with a dry rag or toothbrush may help extend the battery's life.
Dim headlights: Dim headlights can indicate a low battery voltage.
Electrical issues: General electrical problems, such as issues with the dashboard or electrical system, can be a sign of a dying battery.
Cranking but no start: The engine might crank but the vehicle won't start.
Swollen battery case: A swollen battery case can lead to leaks that can damage surrounding components or pose a safety hazard.
A battery is generally considered "old" if it's between three and five years old. You can find the battery's manufacture date on the battery's stickers