Bloating device after battery replacement

I have tried to replace the battery for this phone. however when i use the adhesive given to me via black tape. it does not stay on too long and there is a gap coming out of the phone.

Image as attached.

Could this be a faulty battery that i need to buy.

Does anyone have any references or leads to where can i get a replacement battery in singapore?

Block Image
Block Image
crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

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