HELP! Battery is dead
 

I haven't driven my car for a few weeks now and I think the battery is dead. I am not able to use my key to gain entry into the car and cannot open the trunk lid with my remote. I had AAA and the didn't even want to try to open it. I am at a complete loss right now. Can anyone please provide info? Also, I opened the key to check the battery on my remote door opener and cant seem to get it to fit right; not sure how the spring is installed. I appreciate any help..
Edgar 650-302-4953