Traction control + break light

Replaced my dead battery today, started the car and got the yellow traction warning light along with the break light. Car did all sorts of weird stuff on the way up, acted like it was dragging sometimes and didn't other times. I got it up to 80mph on the highway and it was fine then but felt like I had no power and brakes were dragging at other times.





I have an 03 325i sedan. Any ideas?