Why is my battery light on, and why did other lights on my dash come on after?

What is your question?

For a couple months my car has been having the battery light come on and off again, each time it would come on I would go to autozone and have them check my starter, alternator, and battery, and every time it came back saying everything was just fine. Within this week or so ago my car had the battery light come on again, but this time it stayed on. Today, I had went out to eat and went to turn my car on and it failed to turn on, so I had to be jumped. I went to walmart and they drained my battery, charged it, and tested it to see if it was good, and it passed, but my light was still on, and once again my cars alternator and started passed. So now, after going home, I went back out and my battery light was still on, but it almost failed to start, and then my ABS and emergency brake lights came on on my dash, as well as my airbag. What is going on, what can I do?

How long has your 2008 Scion tC had this problem?

On and off for months, now a problem