The car is a 94 Civic Dx

I searched. but nothing came back up with this issue

Yeserday the car dies. I didnt have time to get to it, had to walk to work

Then this morning I was out side trying to start it, and at first it does nothing like a dead battery. okay so I pull key out, put back in, and depress clutch and turn the key and I get this weird loud click noise from inside the cab.
fallow the noise around, and find out its next to the fuse box with a bunch of wires plugged into it... Not sure what it is...

So then I get cables and jump it.... the car fires right up... wtf? like nothing happened... weird. well to me.
So I was like SWEET! car is running, let it run for about half hour, check the battery, alternator with my Volt meter and its saying 14.556 Volts...well alternator is working fine... batter has juice. but when it wouldnt turn on, I checked battery again and it read 6.4V well car needs 9V to start. so I run inside the can, check something. come back out, and battery is reading 12.6V

WTF?

I need to get this shit startened out by tomorrow so if anyone can tell me wtf is goin on, I would love that

Here is a pic of what I am looking at thats making the noise.