Insert the flat end of a spudger underneath the right edge of the battery, opposite the cables.

Slide the spudger underneath the battery and gently lift to separate the adhesive securing it to the keyboard.

Make sure you push the spudger underneath the battery and not into it. Don't bend or deform the battery.

If the battery isn't separating, apply a few drops of isopropyl alcohol (>90%) to its edge and slightly tilt the keyboard. Wait one minute for the alcohol to soften the adhesive and try again.

Remove the battery.