Battery Issues
 

I have a 2006 Civic LX. The battery keeps dying even though nothing is left on. Had it tested at Advanced Auto but they said it was still good. The alternator is also good. The guy at Advanced Auto said some of the newer Civics won't start back up if the battery is disconnected. Does anyone know if this will happen with an '06 Civic LX? Also, why would the battery keep dying if it's still good?

just a guess but you might have a short somewhere in the wire harness.

might do a simple test, charge battery, check voltage, do not hook up battery during parked. check battery before hook up and starting.( if the same or close to same ) battery is good. Next time car is parked for overnight do not disconnect cable, check voltage after shut down, and in the am check voltage. If low, you have a line draw ( too much ) Then Honda can check to see where voltage draw is if the car is under warranty. Or you can check to see if there are any burnt out bulbs, ( this has cause the system to have a draw )