Audi A4 FSI 2.0 petrol is not started, jump started it and drived it for two hours and it started okay?

Audi A4 FSI 2.0 petrol is not started, jump started it and drived it for two hours and it started okay, the following day the car couldn't start, even the key to unlock the doors seem to lack power. What could be the problem?Audi A4 FSI 2.0 petrol is not started, jump started it and drived it for two hours and it started okay?Have you battery tested and have the car checked for a parasitic voltage drain.