Key Fobs not working

[Balloonmeister]

Plz don't let this hijack this thread, but a question for Particlewave:
I just bought my first Boxster, a 2003 S. I have installed a new battery in the car and will be leaving it in my condo garage for 4 weeks and then again for several months when we are away. All electrical systems, including the key fob, work as designed. My plan is to disconnect the battery's negative cable, leave the front trunk lid open (and adjust the latch mechanism so that it can't inadvertently close itself), and drop the windows a few mm's. The car will be unlocked and covered in the garage. My whole purpose is to absolutely minimize any drop in the battery voltage while I am away. I do not have the capability to attach a battery maintainer on the car as it is in our condo's underground garage and they would not allow something like a maintainer to be plugged into their electrical circuit in the garage.
Will this set up be the best in your opinion with regards to my objective? Thanx in advance.