Tj Max

The other day I went to start my car and it was completely dead. No lights , clock , or anything. Pulled the battery out and noticed it was over 5 years old so the next day the first thing I did was replace it. Fired right up with no hesitating. Drove around for about 20 minutes and parked it. Came out two hours later and its completely dead again. Terminals are clean and very tight and nothing electricity has been added to it. I unfortunately don't own a voltmeter to check voltage but any guidance would be appreciated