[Spridgets] Battery?

[cmanuel at wi.rr.com]

happy 4th in advance, list-

So after about two weeks of my car sitting in the garage, the battery is dead.  I know we've had discussions of old batteries and such, but mine is only 2 years old.  

I just can't see anything bleeding off voltage on this sitting for a couple weeks.  I don't even have half the lights installed yet.

I do know my system is charging, and charging well when running (alternator conversion).  There is water in the battery as well.

Before I take my battery back since its under warranty, is there something else I should be looking at?  I confirmed that no lights are left on.

Chris