How do I change the battery in my BMW?

I have tried to change the battery in my BMW, and I can not get the old one out. There seem to be one bolt at the bottom and I cant get it loose. Any ideas?How do I change the battery in my BMW?
Try this link. It has step-by-step instructions with some pictures. Good luck.



OOPS!!! Sorry, here it is %26gt;%26gt;%26gt;



http://www.ehow.com/how_4735903_check-ch