Battery light comes on occasionally shortly after starting car, while moving

Hello, This may be an issue with corrosion between the battery, alternator, or ground. Also, it may be caused by high resistance in the voltage regulator until it warms up. It is an odd problem. You will need to have this tested after leaving the car overnight with a technician, or testing the voltage from the alternator first thing in the morning. This should be done before, during, and after the light turns off. Very neat problem for a technician to solve, but very annoying to have happen.