The battery and alternator work together to keep your car running. The battery stores electricity for the car and the alternator recharges the battery. The battery supplies the car with power when the car is not running. That is why you can sit and listen to the radio with the engine turned off. Once the engine is turned on, the alternator continuously recharges the battery. If the alternator is not working properly, the battery will quickly run out of power. Alternators and batteries are expensive, so before you start switching out parts you need to figure out which component is causing a problem.
Check the condition of the battery. A lack of maintenance can lead to battery problems. The cables should be tight. Clean any corrosion off the connectors.