How to Determine When to Replace a Car Battery?
2 Answers
Methods to determine when to replace a car battery: 1. If a car battery has been in use for more than five years and shows signs of power loss, it can be directly replaced with a new one; 2. Difficulty in starting the vehicle or weak battery performance indicates power loss, and the battery should be promptly checked. If the battery frequently loses power during normal use, it also suggests power loss and should be replaced. When using a car battery, it's important to pay attention to the method. If the car is not used for a long time, it's advisable to start the car at least once a week, letting the engine run for a while or taking the car for a long-distance drive. Additionally, avoid using the car air conditioner or other high-power electrical devices after turning off the engine, as prolonged use can lead to battery power loss and affect its normal lifespan.
After driving for so many years, I've seen battery issues several times. The most obvious sign is when the engine struggles to start, taking several turns to fire up, or simply not responding, especially during cold winter starts. Another good method is to check the brightness of the headlights—it's not obvious during the day, but try turning them on at night. If the light is dim or flickering, there's an 80-90% chance the battery is nearing its end. Battery lifespan is typically three to five years. As it ages, the electrolyte dries up, and internal electrodes corrode, leading to performance degradation. It's advisable to use a multimeter to measure the static voltage—if it's below 12.4 volts when parked and not running, be cautious. If the charging voltage doesn't reach 13 volts after starting, that also indicates a problem. For maintenance-free batteries, regularly check the inspection window—green means normal, while black or white means it's time for a replacement. Don't wait until it completely fails, as this can damage the starter and compromise driving safety. Regular checks can save you a lot of money.
