I changed my battery out and now it won't turn over. on 2001 Volkswagen Passat

My battery had a bad cell so I bought a new one. when I changed it out all the electrical components work IE ,.radio, windows. Now it won't even turn over now. I put the old battery in and I tries to start but doesn't enough juice. had new battery check and it is good.

Asked by for the 2001 Volkswagen Passat