Common signs your car battery needs replacement include slow engine cranking, dim or flickering headlights, and warning lights on your dashboard such as “Battery” or “Check Engine.” Visible corrosion, swelling, or leaks on the battery case are also indicators. If your battery is older than 3-5 years, its performance likely declines. Inconsistent electrical system behavior or failure to start the vehicle reliably warrant testing or replacement. Regular inspections and professional diagnostics can identify battery health early, helping avoid unexpected breakdowns