Location of the battery

It's under the hood, right next to the window washer reservoir. To get to it you need to slide the thing on top about an inch towards the steering wheel to release it and get it out of the way. Now, if you look down between the battery cover and the fuse box you'll see two long tabs pointing up towards you. Sqeeze them both and pull up and that'll release the battery cover. When reinstalling, be sure to insert the two lugs into their repective holes on the headlight side of the battery cover.

Check under the back seat