First of all we must extract the tray of the cards.

We remove the trims from the back shell by using a tool that is thin enough.

Remove the six Phillips screws (PH # 00) that hold the housing, and with the help of a tool we uncouple all edges of the housing.

We disconnect the battery that we are going to replace, and with the help of the two stickers that are in the top and bottom of the battery, we will pull them little by little and we will take off the battery.

In case the adhesives are broken, which is likely, we can use a plastic and thin tool to take off the battery.