I left the lights on in my car for about 5-6-7 hours, and now my car wont start. I was also low on gas, so I put some in. I tried jumping the car for about 10 minutes, but it didnt start. I took the cables off and tried to start the car without the cables, and it got worse. So thats why i was thinking it was the battery, BUT, my lights still work and my radio does too. Headlights as well. I did test #9 on my OBC, and it read 10.50, and decreased from there for as long as my car stayed on. What does this actually mean? Does it means my battery is dead or my alternator is broken? I haven't tried to jump the car while doing test #9. Should the voltage increase or would that make a difference? It's dark now, so I have to wait till morning to check, but I need a lil help.