To begin we will have to extract the tray of the cards.

We unhook all the edges of the back cover using a fine enough tool.

We remove the six Phillips screws (PH # 00) that hold the housing, and with the help of a fine tool we will unhook it.

We disconnect the battery to work with greater security.

Finally, with the help of a plastic tool, we will carefully detach the battery that we need to replace.