removing back cover to replace battery

My Macbook air only has 8 screws - all of the videos show 10 screws.

I have removed all of the screws and go to remove the back and it does not lift off so nice and easy - looks like there is a catch about halfway on both right and left side. Do I force it open?

Okay - so first of all it was not a Macbook Air - it was a Macbook. I took a picture of the writing on the back and was able to zoom in and find the model and EMC number.

Once you get the screws out there are 2 clips - one on each side that are a bit stubborn...but you get them unclipped and you got it.

I also had the wrong battery....so wait for now

Thanks for the feedback

Pat