DO NOT attempt to remove the phone battery with a metallic/sharp prying object.

Disconnect the battery from the phone by removing the battery connection from the connector port.

Remove the battery by prying the underside of the battery and pulling upwards with the opening pick (shown in image 2).

Do not be too rough with the battery, as it is easy to dent/break into.

Now, place the new battery inside the slot, firmly pressing it into the space against the copper-colored heatsink on the bottom.