Would a defective battery cause your car to not accelerate?

Yes, a defective battery can prevent a car from accelerating properly. The battery is responsible for providing electrical power to the starter motor, which cranks the engine. If the battery is not able to provide enough power to the starter motor, the engine will not be able to start. Additionally, a defective battery can cause the car's electrical system to malfunction, which can also lead to acceleration problems. For example, if the battery is not able to provide enough power to the fuel pump, the engine will not be able to get the fuel it needs to run properly. This can cause the car to hesitate or stutter when accelerating.