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It would be best to have a trickle charger, but for 3 weeks you'll probably be OK. You will need to open the door lock manually with the key when you get back.
Correct, and you will need to put the key in the ignition within about 30 or 60 seconds and turn to position #1 or full start, or else the alarm with activate.
I didnt know about this.. thanks for the info. I know now
The car goes into this "sleep mode" after about 5 days of inactivity. To get another 5 days, just hit your "lock" button on the key fob again on about day #4.
If you have time, pick up something like this maintainer - available at Walmar for $19 (based on my google search) and probably most local auto parts stores.
Schumacher Automotive SpeedCharge Battery Maintainer and Charger