what could cause my porsche from starting after i have replaced the old battery on 2004 Porsche Cayenne S

the car displayed engine battery so i replaced the old with new one. But then it won't even kick or start. This has happened before but when i changed the battery it started immediately. At a time too it was giving had start. Please advice

Asked by for the 2004 Porsche Cayenne S
here is a Porsche PIWIS-2: so that you will be able to check if your car works well any time.