Samsung Galaxy A50 Battery Replacement

Steps:
Insert a SIM card eject tool, a SIM eject bit or a straightened paper clip into the hole on the SIM tray located at the left side of the phone.
Press firmly to eject the tray.
Remove the SIM card tray.
When reinserting the cards, make sure to properly orient them in the tray.
The adhesive of the Samsung Galaxy A50 is very strong. A hair dryer, heat gun, or hot plate may also be used if you aren't able to open the device with the iOpener. Be careful not to overheat the phone-the AMOLED display and internal battery are both susceptible to heat damage.
Insert an opening pick at the bottom of your phone near the USB-C port.
If you can't get between the back cover and mid-frame with your opening pick, you can use a suction handle or strong tape to pull up the back cover to create a gap.
Slide the opening pick to the bottom left corner.
Insert a second opening pick and slide it from the bottom to the top left corner to cut the adhesive.
If you have trouble, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.
Leave the opening picks in place to prevent the adhesive from resealing.
Insert a third opening pick under the top left corner of the back cover.
Slide the opening pick along the top edge of the phone.
Leave the opening pick in the top right corner to prevent the adhesive from resealing.
Insert a fourth opening pick under the top right corner of the back cover.
Slide the tip of the opening pick along the side of the phone to the bottom right corner to cut the adhesive.
Leave the opening pick in the bottom right corner to prevent the adhesive from resealing.
Remove the back cover.
After installing the back cover, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond-a stack of heavy books works well.
Remove the 13 Phillips #00 screws (4 mm length).
Insert an opening pick between the display and the mid=frame at the bottom of your phone above the USB-C port.
Slide the pick along the bottom edge to release the clips.
Continue sliding the pick along the left edge of the phone to release the clips.
Slide the opening pick along the top edge.
Separate the mid=frame from the phone
Use a spudger to disconnect the battery by prying the connector straight up from its socket.
Use the flat end of a spudger to pry up and disconnect the interconnect and display flex cables from the motherboard.
Use the flat end of a spudger to pry up and disconnect the charging port and display flex cables from the daughterboard.
The adhesive that holds down the battery in the Samsung Galaxy A50 is extremely strong.
Apply some isopropyl alcohol under each corner of the battery and allow it to penetrate for several minutes to help weaken the adhesive.
Insert a plastic card underneath the bottom edge of the battery and carefully slide it underneath the battery.
Continue sliding the plastic card underneath the battery to loosen the battery adhesive.
Remove the battery.
Do not reinstall a damaged or deformed battery, as doing so is a potential safety hazard. Replace it with a new battery.
Before installing a new battery, remove any remaining adhesive from the phone, and clean the glued areas with isopropyl alcohol and a lint-free cloth.
It's done.. Do the same in reverse process to re-install new battery..
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[@shahidnadeem4675]

No glue needed to reinstall the back cover?

[@TechGuy9018]

It needs but adhesive is as it while removing then you can fix with that only. no need of glue.