Phone · Samsung · Galaxy S21 Plus
Samsung Galaxy S21 Plus Battery Replacement
Battery Replacement guide for the Samsung Galaxy S21 Plus
Before you begin
Tools
- Phillips #00 screwdriver
- Heat gun or hair dryer
- Suction cup tool
- Plastic prying tools
- Spudger tool
- Plastic opening picks
Parts / materials
- Replacement Galaxy S21 Plus battery
- Battery adhesive removal strips
- Rear glass pre-cut adhesive strip
- 90%+ Isopropyl alcohol
- Lint-free cloth
Safety
- Work in a well-ventilated area when using isopropyl alcohol.
- Do not bend, puncture, or apply sharp metal tools near the battery.
- Wear safety glasses to protect against small glass shards if the rear panel breaks.
Overview
Step-by-step
- 1
Power Off Phone
1 minPress and hold the Side and Volume Down buttons until the power menu appears. Tap Power Off and confirm the device shuts down completely.
- 2
Eject SIM Tray
1 minInsert a SIM eject tool into the small hole at the bottom edge of the frame. Push straight in to release the tray, then slide it out.
- 3
Heat Rear Cover
2 minUse a heat gun or hair dryer set to low heat on the rear panel for two minutes to soften the internal adhesive.
- 4
Attach Suction Cup
1 minPlace a suction cup onto the lower third of the rear glass. Press firmly to create a seal against the glass.
- 5
Insert Opening Pick
2 minPull upward on the suction cup to create a slight gap at the bottom seam. Slide a plastic opening pick into the gap.
- 6
Slice Rear Adhesive
4 minSlide the opening pick along all four edges of the rear panel to cut through the perimeter glue. Reapply heat if resistance increases.
- 7
Lift Off Rear Cover
1 minGently lift the back panel away from the frame and set it aside on a clean surface.
- 8
Unscrew Wireless Charging Pad
2 minUse a Phillips #00 screwdriver to remove the five screws holding the upper wireless charging assembly in place.
- 9
Remove Wireless Charging Module
2 minPeel the wireless charging coil up from the battery and lift the plastic cover off the motherboard.
- 10
Disconnect Battery Cable
1 minPry the battery connector straight up from its motherboard socket using the flat end of a plastic spudger.
- 11
Unscrew Loudspeaker Bracket
2 minRemove the six Phillips #00 screws securing the bottom loudspeaker cover to the lower frame.
- 12
Remove Loudspeaker Module
2 minInsert a plastic prying tool under the edge of the loudspeaker assembly and lift it out of the phone.
- 13
Disconnect Display Cables
2 minDisconnect the main and display interconnect flex cables from both the motherboard and sub-board, then lift them away.
- 14
Apply Isopropyl Alcohol
3 minApply a few drops of high-concentration isopropyl alcohol along the top and side seams of the battery bay.
- 15
Pry Out Old Battery
5 minSlide a flat plastic card or pry tool beneath the battery and gently lever it out. Never use metal tools or bend the battery cell.
- 16
Clean Battery Recess
2 minWipe away remaining adhesive residue inside the battery cavity using a lint-free cloth dipped in isopropyl alcohol.
- 17
Apply Battery Adhesive
2 minPeel the backing off new battery adhesive strips and press them firmly into the battery bay frame.
- 18
Install New Battery
2 minSet the replacement battery into the frame recess and press down firmly to set the adhesive.
- 19
Reconnect Interconnect Cables
2 minAlign the interconnect flex cables over the motherboard and sub-board sockets, pressing down until they snap into place.
- 20
Reconnect Battery Connector
1 minAlign the battery flex cable over the connector port on the motherboard and press down until it clicks securely.
- 21
Reinstall Loudspeaker Assembly
2 minFit the loudspeaker housing back into the lower frame and secure it with its six Phillips #00 screws.
- 22
Reinstall Wireless Charging Assembly
2 minPosition the wireless charging pad and upper cover over the motherboard and reinstall the five Phillips #00 screws.
- 23
Apply Rear Cover Adhesive
3 minApply pre-cut adhesive tape around the perimeter of the phone frame and remove the top protective film.
- 24
Seal Rear Cover
2 minAlign the back glass cover over the chassis and press firmly around all edges to form a tight seal.
After your Samsung Galaxy S21 Plus battery replacement
Power the Galaxy S21 Plus back on and test the battery replacement function before you put every screw away. Check touch/display response, charging, cameras, buttons, and wireless as relevant to this repair. If something fails after closing the device, reopen carefully and reseat the connectors for this Samsung Galaxy S21 Plus job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.
Keep learning
Explore more Samsung Galaxy S21 Plus repair context in the encyclopedia, or open related DIY guides.

