The battery is what powers every electrical component in a car.
At some point, the car battery needs to be replaced, but when? Is
there a way to tell that the battery is failing? How long does it
last? Let's start with why the battery needs to be replaced. Most
cars have lead-acid batteries that are made of six cells with lead
and lead-oxide plates filled with an electrolyte (dilute sulfuric
Car battery Over time, a lead-acid battery loses some of its capacity,
mostly due to sulfation. At some point, the capacity will drop so
low that the battery won't be able to start your car. How long can
it last? An average car battery lasts from 5 to 7 years.