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Flooded lead-acid batteries cost $80 to $180, last three to five years, and require upright mounting and venting. AGM batteries cost up to $400, last five to ten years, handle vibration better, and are required for modern auto stop-start systems.
Most flooded lead-acid 12-volt car batteries can be refurbished at home using Epsom salts and baking soda. Batteries with heavy corrosion, voltage below 10 volts, or physical damage require replacement. The process involves cleaning, replacing acid, and charging for 24 to 36 hours.
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