How do I get to the bolt holding the battery in place on my 2004 cruiser?

Usually just a ratchet wrench, 12" extension and the correct size socket.

You have to remove the air filter housing. Unscrew the clamp holding the hose on the top of the housing, remove the air filter, and just grab the sides of the box and wiggle/lift until it pops up. The wedge is right there!