Disconnect all chargers and accessories, and shut down or hold power button for 10 seconds until laptop shuts off.

Flip the laptop over, and push the two tabs shown in the photo inwards until it clicks. push battery upwards away from laptop to remove battery.

Using a Philips #2 screwdriver, unscrew the center screw on the back cover. The screw is captive so it will not leave the base, but will click when fully loosened.

Push the base cover down towards you until it slides down a little bit with a click, then lift the protruding part up to remove the cover