iPhone Battery Replacement Stuck, Adhesive Strip Tape Break FIX [SOLVED]
If you are doing an iPhone Battery Replacement and the Adhesive Strip breaks. Use an old gift card or credit card (or any card) and scrape underneath the battery to catch the Adhesive Strip (see video). This worked for me the first time and is easier (and more successful) than other methods that use dental floss or fishing line as recommended by other videos.
NOTE: this works on Android smartphones also!