My car was in the body shop for about 3 weeks. I noticed when they were doing a final wash, they let my car idle.

I drove home, and everything was normal. It is a 20minute drive. When I went to start it up again, the motor would BARELY crank, and wouldn't even start. We had to start it on a rolling push..I drove around for a bit. Then, I started again, and it cranked slowy, but started. It cranks slowly and starts up (this happening about 4 times today)
When the car sits and is moved occasionally for 3 weeks, does it drain the battery? I believe the charging system is okay, since I'm not getting a battery light on the dash.

 

i had something like this happen
there was no visible corrosion on the terminal, but inbetween the lug and the terminal there was
it was a bitch until i figured it out and cleaned it up