Repeat the procedure to remove the three remaining adhesive strips.

If a strip broke and you couldn't retrieve it:

Apply a few drops of high concentration (>90%) isopropyl alcohol underneath the edge of the battery nearest the broken strip.

Wait one minute to allow the isopropyl alcohol to weaken the adhesive.

Slide an opening pick under a loose edge of the battery and gently pry up the battery.

Be careful not to bend the battery. If it feels stuck, apply a few more drops of isopropyl alcohol and try again.