A dead car battery means that there is insufficient charge or power in the battery to start the car or for it to function normally.

There are several options available to charge a dead car battery:

1. External charger: You can use an external charger, also known as a battery charger, to charge the battery. Connect the charger to the battery according to the manufacturer's instructions and let the battery charge until it has enough power to start the car. This can take some time, depending on the capacity of the battery and the power of the charger.
   
   

2. Jump start: If you don't have immediate access to a charger, you can use a jump start. This can be done using jumper cables and another car with a fully charged battery. Connect the jumper cables to the batteries of both cars according to the correct polarity and let the car with the full battery run for a few minutes to charge the dead battery. Then, try to start the car with the dead battery.
   
   

3. Charging while driving: If you can start the car using a jump start, you can let the car run and charge while driving. This means that the car's alternator charges the battery while driving. It is advisable to drive for a while to sufficiently charge the battery before turning off the engine.

It is important to note that if the battery repeatedly goes dead or does not charge properly, there might be a problem with the battery itself or the car's charging system. In such cases, it is advisable to consult a professional mechanic to diagnose and fix the problem. When working with batteries, it is also important to take the proper safety precautions, such as wearing protective gloves and following the manufacturer's instructions.