A car is considered to be dead without a battery or with a dead battery. Because it is the battery that produces power for the car engine. Thus, with a dead battery, the car engine stays unresponsive. The battery could keep draining for a variety of reasons. The reason might be its age, or it might be any kind of human error. Sometimes, the presence of a bad alternator can drain the car battery. Corroded battery terminals can also cause the same on odd occasion. Since figuring-out the cause can be tricky, hence you should consult a car professional who can help you to overcome the frustration caused due to faster battery drainage.