When one discovers he or she has a dead battery when trying to ignite a car, It is a bit disappointing, but they are several ways of charging it.
Knowing how dead is your car battery
A good battery will show 12.4-12.7 volts when measured across a voltmeter. In case it is below, the car battery may not restart this; you will encounter some problems.
If one car battery is above 12 volts
If one vehicle is above 12 volts, it is best to recharge. The best solution is by driving your car around and switching off all the parts in the vehicle that can drag the battery down to increase the power of the battery.
If the car battery is below 12 volts
When the battery goes below 12 volts, it is considered a discharge. The car cannot recharge the battery, so the best solution is by using a jump start.