Pull on the black pull tab at a shallow angle with steady force. When the adhesive grows long, roll it around a spudger and continue pulling.

Continue firmly pulling up on the adhesive strip with constant force, spinning the spudger every so often to keep the exposed section of the pull tab as short as possible.

This may take a lot of force.

These adhesive pull tabs are very prone to snapping in half during this process. Try pulling as slowly as possible.

If the adhesive pull tabs are not stretching, you can fill a plastic dropper or syringe with high concentration isopropyl alcohol and apply a few drops under the left edge of the battery. Give the alcohol a minute to weaken the battery adhesive.

Continue this process for each of the three pull tabs, until all are either out or have snapped in half.