Electrochemical devices that provide electrical power to start a vehicle's engine and supply energy to its electrical systems when the engine is not running. They store and release electrical energy through chemical reactions. Accessories related to batteries include items like battery chargers, jump starters, terminal cleaners, and battery testers. These accessories aid in maintaining battery health, ensuring reliable starting power, and extending the battery's lifespan. They are crucial for preventing breakdowns and ensuring the vehicle's electrical system functions properly.