When you drive your car, its electrical systems are constantly using battery power. Even if the engine’s not running, there’s still plenty of electricity going on behind the scenes. Your car battery supplies that power, and it does so even when the engine’s not running. That’s because your car has a starter motor that requires electricity to get everything moving smoothly again after you shut off the ignition and remove the key.
When you leave your car for an extended period — like during cold or hot weather — your car battery drains slightly and needs to be recharged. The alternator does this automatically whenever the engine is running, but that still requires some energy to operate. So, how do you know when it’s time to replace your car battery? Here are some indicators: