Red Battery symbol, then abs dsc please help

[dabenthusiast]

Well I started driving 2001 x5 3.0i 5mt.
Stopped to take some pictures of the car, when I got back in and started the car I was hit with red battery symbol.
I restarted car, same thing so I continued to drive.
When pulling up to my destination I was hit with abs and dsc and all.
When starting car to leave back home I got around the corner with battery lights, abs, dsc, and no the airbag lights!
Pulled over to restart car, now car doesn't start. Leaving my car in the city for acouple days so please someone help me try to figure out before I go to the shop and waist money.

Battery seems to be fully charged. When turning key over all I get is two click clicks all lights on dash illuminate but no start.

Before i pulled over windows were rolling up so slow.
Then with car off the windows went up fast like normal.

Could it be alternator???
Sorry for long post but information should help.

Thanks