Clicking, battery drain somewhere in dash

So our car would not start the other day, so I took the battery out, charged it put it in the car and she started right up. The next morning, nothing, no lights dash or elsewhere. Then after a minute I hear clicking coming from the car. I try to start it again, but this time I get dash lights for a moment before they dim. When setting in the car trying to hear the sound again, I hear it coming from the dash. It is like a rapid clicking sound (five clicks/second for about three seconds) and then, nothing. Where should I start?