Starting issues

Bad battery and DEAD battery are two different things. Have you charged it? Determine if the car's system has a parasitic draw

Unhook the ground cable and wire a test lamp in series with the ground. Look at the bulb in subdued lighting. ANY glow from the bulb (make sure everything is turned off) means you have a drain.

Might pay to charge it and take it to someone who can load test the battery.