What is this for on the charging port?

When I took this out of the package the tab flaked off before I could install my new part. Would the device still work/ charge without it? Will i need the part to be replaced for it to work properly?

Block Image

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0