Charge the battery start the engine and confirm that the voltage at the battery is about 14 volts with engine running . If not it is likely the alternator is bad or the electrical connections from the alternator to the battery are defective.
A significant drain from the battery can be determined by observing the battery voltage after stopping the engine.
If it is under 12 and continues to drop trouble shoot for battery drain. If you suspect the radio pull the fuse and observe.
SOURCE: kia rio 02 died while driving down highway
The battery is only use to start the car, once the car is moving the alternator takes over and charges the battery. I sounds like the alternator is bad. You take the alternator to Napa, Auto Zone or Advance auto part and have them check it for you.
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