human
How can I tell when it's time to replace my car's battery?
assistant
You can tell when it's time to replace your car's battery by checking the vehicle's owner's manual. It should specify how many miles you can expect the battery to last before needing to be replaced. Additionally, if the battery is starting to lose charge or not hold a full charge, this could also indicate that it is nearing the end of its life and needs to be replaced.