To open the lid it is necessary to remove two "pentalobe" screws.

Use a suitable screwdriver.

Press with your fingers forward to move the lid.

Remove the battery cover.

The battery connector is supported by two Phillips screws.

Remove the part under the upper screw colored green and keep it. Due to its size it is very easy to lose it.

Disconnect the battery with a plastic tool so as not to damage the board or the connector.

Pull the plastic strip to detach the battery.