Don't bend or crease your battery cells. If they feel stubborn, apply a few more drops of isopropyl alcohol and try again.

Insert the flat end of an opening pick between the stuck battery cell and the speaker.

Slowly and steadily pry up the battery cell.

Depending on how strong your adhesive is, this may take some time. Allow up to a minute of constant pressure for the adhesive to loosen.

Repeat this process for any additional stuck cells.