When does a car battery need to be replaced?
The main function of a car battery is to start your car. Today, most cars have a single maintenance-free 12-volt acid battery. The car battery is rechargeable. It uses its charge to power the vehicle systems while it's parked and to turn over the engine when you want to start it. Once you start the car, the alternator generates additional electric power to recharge the battery. Over time, the battery loses its capacity or ability to hold charge. One [...]