When a car is not driven for an extended period, the negative terminal of the battery should be disconnected. Removing the negative terminal cuts off most of the standby power consumption in the vehicle, allowing the battery to discharge naturally. Disconnecting the negative terminal enables the car to remain parked for a longer duration and better protects the battery. The battery is a crucial component of a car, supplying power to all electrical devices when the engine is not running, and it is also responsible for starting the engine. After the engine is started, it drives the alternator, which then powers all electronic devices in the car and recharges the battery. The battery also requires regular maintenance. If poor power supply is detected, avoid using the car's electrical devices before starting the engine, such as electric air pumps, audio systems, warning lights, power windows, etc. Additionally, do not turn off the engine immediately after starting it, as the battery has just consumed a significant amount of power and has not yet fully recharged. Excessive power consumption will only lead to insufficient battery supply, making it harder to start the engine and shortening the battery's lifespan. Frequent discharging and recharging can cause a memory effect in the battery. Battery Working Principle: The battery uses lead plates filled with sponge-like lead as the negative electrode and lead plates filled with lead dioxide as the positive electrode, with a 22% to 28% dilute sulfuric acid solution as the electrolyte. During charging, electrical energy is converted into chemical energy, and during discharging, chemical energy is converted back into electrical energy. When discharging, metallic lead acts as the negative electrode, undergoing oxidation to form lead sulfate, while lead dioxide acts as the positive electrode, undergoing reduction to form lead sulfate. When charging with direct current, the electrodes regenerate lead and lead dioxide. After the power source is removed, the battery returns to its pre-discharge state, forming a chemical cell. Lead-acid batteries are rechargeable and are called secondary batteries. Their voltage is 2V, and typically three lead-acid batteries are connected in series to achieve 6V. Cars use six lead-acid batteries connected in series to form a 12V battery pack. Regular lead-acid batteries require periodic replenishment of sulfuric acid to maintain the electrolyte concentration at 22% to 28%. Battery Maintenance: Batteries are most vulnerable to low temperatures, as their capacity is significantly lower in cold environments compared to normal temperatures. Therefore, regular inspection and maintenance are essential. Daily precautions include: Avoid parking the car in open areas for extended periods. If long-term parking is necessary, remove and store the battery to prevent freezing damage. In winter, car engines are harder to start. Each attempt to start the engine should not exceed 5 seconds, with intervals of at least 15 seconds between attempts. If the engine fails to start after multiple attempts, check other aspects such as the electrical circuit, ignition coil, or fuel system. Avoid continuous starting attempts, as this can over-discharge and damage the battery. Car batteries should be charged regularly. A battery left unused will gradually self-discharge and eventually become unusable. Therefore, start the car periodically to recharge the battery. Clean the battery terminals periodically and apply specialized grease to protect the wiring harness. Regularly inspect the battery's components and connections. Avoid using car electrical devices after turning off the engine. Using the battery alone without the engine generating power can cause damage.
