What do I do about an indicator light that came on - looks like a battery? on 2007 Toyota Camry

The light came on last night and is still on this morning. It says to call the dealership - is this necessary?

Asked by for the 2007 Toyota Camry
No, you don't need to call the dealership. The light is indicating a charging system issue. Either a failing battery or a wearing out alternator. Need to have inspection to determine which.