What is the cost to charge a car battery by plugging into household outlet?

Charging a car battery by plugging into a household outlet generally costs less than the price of having it professionally charged or replaced. The exact cost depends on the battery's condition, type, and your electricity rate. On average, recharging a standard 12-volt car battery can cost about 1.5 - 8 kilowatt-hours (kWh) of electricity and can take around 10 - 16 hours to fully charge. Assuming an average electricity rate of around $0.10 per kWh, the charging cost would be approximately $0.15 - $0.80 per complete charge. Some high-capacity vehicles like electric cars with larger battery packs may consume more electricity to charge. It's recommended to always follow the guidelines and instructions provided in your car's owner's manual when charging the battery at home.