battery light on while driving on 2004 Volvo C70

What would cause the battery light to come on while driving? Is this a concern while driving?

Asked by for the 2004 Volvo C70
The Battery Light comes on while driving because the Charging System is not working properly, so YES, this is a concern. I would have a Charging System Inspection performed on your vehicle ASAP. You could end up with a dead battery and be stranded some where.