Take care not to bend the battery—it can leak dangerous chemicals and/or catch fire.

Firmly secure the battery with one hand.

With your free hand, insert a plastic card between one of the long edges of the battery cell and its housing.

Pry up with the plastic card and apply steady pressure until a gap forms.

Be patient and allow plenty of time for the adhesive to separate. If you're having trouble creating a gap, apply more heat and try again.

Slide the card under the battery cell.