What to do when battery light comes on, ut stays off after restarted.

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My battery light came on while driving, and shortly after the radio shut off, lights flickered down. It then restarted. I pulled to the side, powered the car off and waited. I started it up again about 5 min later and no light, car drove home fine. Tis makes me very nervous. Oh yeah, btw, I just got it back from the dealership resolving a check engine light