What are the reasons why a car battery cannot be charged?
3 Answers
Car battery cannot be charged due to battery aging, battery water loss, battery plate sulfation, or circuit failure. The specific reasons are as follows: Battery aging: Once the battery ages, it will result in failure to charge. Battery water loss: When the battery loses water, it can also cause the electric vehicle to fail to charge. Simply replenishing water into the battery can solve the problem. Battery plate sulfation: Battery plate sulfation will lead to a reduction in battery capacity. Circuit failure: If the electric vehicle cannot be charged, it may also be due to circuit failure. Check whether the connection between the circuit and the connector is in good contact. Inspect whether the socket has any sparking, check whether the charger is intact, and whether the charging parameters comply with the regulations.
I've been driving for over a decade and have encountered many cases where the battery won't charge. The most common issue is battery aging—when its lifespan ends, the electrolyte dries up, or the plates become sulfated, preventing charging. Next, you should check the charging system. If the alternator output is insufficient or the belt is loose, power won't be supplied properly. Additionally, corroded or loose wiring connections can block the current flow. It's best to use a multimeter to measure the voltage: at rest, it should be around 12.6 volts, and after starting, it should rise to 13-14 volts for normal operation. If the voltage is low, the alternator might be faulty. For prevention, I make it a habit to clean the terminals every six months to avoid oxidation. Pay extra attention in cold weather, as low temperatures thicken the electrolyte and affect charging. Get it checked early—don’t wait until the car won’t start to fix it, or you’ll be in big trouble.
As a new driver, I recently encountered a situation where the battery wouldn't charge, which was quite worrying. There are mainly several possible reasons: the battery might be damaged, such as aging after years of use; or the charger could be faulty, with the generator not working properly; or the wire connections might be rusty or loose. I remember when I first bought the car, I didn't pay attention to maintenance, and as a result, the battery couldn't charge after deep discharge. Later, I learned that when the voltage is insufficient, it's important to check if the generator is working. It's good practice not to leave the car lights on for too long to avoid draining the battery. If you're unsure about the cause, it's safest to take it to a repair shop and let professionals diagnose it with their equipment, as tampering with it yourself might make things worse. The key to prevention is regular checks, so don't delay and affect your driving.
