My car won't start. It just clicks and won't turn over?

I have a 2009 Kia Spectra and recently it's not been starting after i let it sit for a long period of time. (about 6 hours). I will hear a "clicking" sound, which is probably the ignition alternator, but it will not turn over at all. Usually when this happens I just let it sit for a few minutes, try... show more I have a 2009 Kia Spectra and recently it's not been starting after i let it sit for a long period of time. (about 6 hours). I will hear a "clicking" sound, which is probably the ignition alternator, but it will not turn over at all. Usually when this happens I just let it sit for a few minutes, try again, and it starts. But it gets worse everytime and harder and harder to start. My lights and everything still work too? So is it the battery or something else? If it was a dead battery, would the lights still work?
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