Samsung G780 S20 FE Battery Adhesive (GH02-21855A) is a replacement adhesive part for the battery in the G780 S20 FE. It is listed as a mobile-device spare part and identified as double-sided battery tape.
This part is intended for use where battery adhesive is needed during repair of the named phone. Its designation distinguishes it from battery units and other phone adhesives. The listing identifies Samsung as the brand and GH02-21855A as the manufacturer part number.