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How does a Car Battery Works? A car battery is a rechargeable battery that provides the electrical energy needed to start your car and power its electrical systems. Here's how it works in simple terms: 🔋 What a Car Battery Does Starts the Engine: When you turn the ignition key, the battery sends a burst of energy to the starter motor. Powers Electrical Systems: It supplies power to lights, radio, infotainment system, and sensors when the engine is off. Stabilizes Voltage: It helps regulate the voltage in the electrical system to prevent damage to other components. ⚙️ How It Works (Step-by-Step) Chemical Reaction Generates Electricity A car battery contains lead plates and sulfuric acid. This setup creates a chemical reaction that produces DC (direct current) electricity. Supplying Power to Starter Motor When you turn the key or push the start button, the battery delivers a high current to the starter motor. This turns the engine over so it can begin running on fuel. Alternator Takes Over Once the engine is running, the alternator produces electricity and: Recharges the battery Powers the car's electrical systems 🧪 Inside the Battery Component Function Lead Plates Electrodes that react with the acid Sulfuric Acid Electrolyte that enables chemical reaction Cells (usually 6) Each produces ~2.1 volts = ~12.6V total ✅ Key Facts A fully charged car battery = ~12.6 volts Battery life: 3 to 5 years (average) If the battery dies: The car won't start, and accessories won't work