It killed the 12v battery

A few day ago, I came home from shopping and removed the purchases from the trunk. Two days later, I went to start the car, and nothing happened. Thinking the Smart Key may have malfunctioned, I went back into the house, and got the other one. It didn't work either. The hatch would not open, but it felt as if there were some "play" in the hatch itself, so I then crawled into the trunk and released the hatch by following the directions in the manual. There didn't seem to be anything wrong with the release, but the dome lights wouldn't light and it dawned on me that the 12 v. battery was dead. I had to join AAA to get a jump (under the hood) and the car has acted normally from then on. I put a voltmeter on the jump points after driving 30 miles and it read 12.35 volts. I checked the hatch and it seemed to have the same "play" as before, so I opened it and discovered what I think was the problem all along. The nylon tab for the "luggage storage box" was positioned toward the rear of the vehicle and it was keeping the hatch from closing tightly. The luggage compartment light must have been on for two days and drained the battery. I tucked the tab under the mat, so it couldn't prevent the hatch from closing tightly. Today, I drove another 30+ miles and checked the 12 v. battery voltage an hour after getting home and it read 12.65, so I guess it is getting charged from the alternator? I bought the car in Sept. 06.
Should I purchase a trickle charger (3.5 amps max) or will the battery survive the insult?

 

<div class='quotetop'>QUOTE(efusco @ Feb 25 2007, 09:06 PM) [snapback]396483[/snapback]</div>

Thanks for your reply. As a precaution, I have the light in the luggage compartment switched off.