Samsung Galaxy S21 Plus Battery Replacement - Samsung Galaxy S21+

Step 1 | Heat the back cover

Do not apply excessive heat, which can cause damage to the display and internal battery.

Prepare an iOpener and apply it to the back cover for at least three minutes.

Alternatively, use a hair dryer, heat gun, or hot plate with caution.

Step 2 | Insert an opening pick

Attach a suction handle to the back cover's bottom edge, as close as possible.

If the back cover is cracked, use strong tape or superglue to secure the suction handle and allow it to cure.

Lift the back cover with the suction handle to create a small gap between the back cover and frame.
Apply more heat if needed, following iOpener instructions to avoid overheating.

Insert an opening pick into the created gap, then slide it towards the bottom left corner to slice the adhesive.

Leave the opening pick in place to prevent resealing of the adhesive.

Step 3 | Slice the adhesive

Insert another opening pick along the bottom edge.

Slide this new tool towards the bottom right corner to cut through the adhesive.
Leave both opening picks in place to prevent the adhesive from sealing itself again.

Step 4 | Slice the adhesive

Re-heat the iOpener as needed, using it for 2-3 minutes to warm up the adhesive.

Insert a new opening pick at the bottom right corner of your phone.
Slide this pick along the right edge of your phone, slicing through the adhesive.
Leave the pick in place, top-right corner, to prevent re-sealing of the adhesive.

Step 5

Insert only the tip (~4-5 mm) of the opening pick near the camera assembly to avoid damage or smearing.

Place a fourth opening pick underneath the top right corner.
Slide the opening pick along the top edge to cut adhesive.

Leave the pick in the top left corner to prevent resealing.

Step 6

Insert the opening pick at the bottom left corner.

Slide it along the left edge of the back cover, cutting through remaining adhesive.

When near the power button, only insert the tip (~3-4 mm) to avoid damaging the power and volume button flex cable.

Step 7 | Remove the back cover

Remove the back cover.

Power on your phone and test all functions during reassembly before sealing it up, then power down completely.

Remove any adhesive chunks with a pair of tweezers or your fingers.
Clean away any adhesive residue with high concentration (over 90%) isopropyl alcohol.

If using Samsung custom-cut adhesives, follow the designated guide. If using double-sided tape, follow its specific reapplication instructions.

Step 8 | Slice the adhesive

Do not puncture or bend the battery with your tool, as this can cause chemical leaks or thermal events.

Be cautious of the cable beneath the charging coil.
Work slowly and stop sliding the pick if it catches on the cable.
Insert an opening pick underneath the left bottom end of the NFC antenna and charging coil assembly.
Slide the pick along the bottom left edge to carefully separate the assembly from the battery.

Step 9

Insert a pick under the bottom end of the NFC antenna and charging coil assembly.

Slide the pick along the bottom, separating it from the loudspeaker.

Step 10 | Disconnect the charging coil

Use a spudger to pry the charging coil connector straight up from its socket.

Step 11 | Disconnect the NFC antenna

Disconnect the NFC antenna using a spudger. Pry the connector straight up from its socket.

Step 12 | Unfasten the NFC antenna & charging coil assembly screws

Use a Phillips screwdriver to remove the five 3.9 mm-long screws securing the NFC antenna and charging coil assembly.

Step 13 | Remove the NFC antenna & charging coil assembly

Remove the NFC antenna and charging coil assembly using a pair of tweezers or your fingers.

Step 14 | Disconnect the battery cable

Use a spudger to pry the battery connector straight up from its socket.

Step 15 | Unfasten the loudspeaker assembly screws

Remove the screws holding the loudspeaker assembly in place using a Phillips screwdriver.

The screws are 3.9 mm long.
There are six screws total.

Step 16 | Pry up the loudspeaker assembly

Insert a strong opening pick into the gap at the top edge of the loudspeaker assembly and the midframe.

Tilt the loudspeaker assembly downwards using the opening pick to pry it up.

Step 17 | Remove the loudspeaker assembly

Remove the loudspeaker assembly.

Apply new adhesive during reassembly, after thoroughly cleaning affected areas with isopropyl alcohol (greater than 90% strength).

Step 18 | Disconnect the display flex cable

Disconnect the display flex cable by gently prying its upper connector straight up with a spudger.

Step 19 | Disconnect the main & interconnect flex cables

Disconnect the main and interconnect flex cables from the motherboard. Use a spudger to pry the upper connectors straight up from their sockets.

Step 20 | Remove the display flex cable

Disconnect the display flex cable by using a spudger to pry its bottom connector straight up from its socket.

Careful not to damage the cable or its connectors.

Use your fingers or tweezers to carefully remove the display flex cable.

Step 21 | Remove the main flex cable

Disconnect the main flex cable from the daughterboard. Use a spudger to pry its bottom connector straight up from its socket.

Remove the main flex cable using your fingers or a pair of tweezers.

Step 22 | Remove the interconnect flex cable

Disconnect the interconnect flex cable from the daughterboard using a spudger, prying its bottom connector straight up.

Remove the interconnect flex cable with your fingers or a pair of tweezers.

Step 23 | Disconnect the power button flex cable

Disconnect the power button flex cable using a spudger, prying the connector straight up from its socket.

Bend the flex cable to the side with your spudger to avoid damaging it during battery removal.

Step 24 | Apply high concentration isopropyl alcohol

Strong adhesion requires additional methods.

Apply iOpener to screen for 2+ minutes to loosen battery adhesive.
On gaps between frame and left/right edge of battery, apply 1-2 drops of high concentration (over 90%) isopropyl alcohol.

Use caution not to over-saturate; avoid midframe cutouts to prevent damage.

Allow isopropyl alcohol to penetrate adhesive for 2-3 minutes before proceeding.

Step 25 | Insert an opening pick

Insert the opening pick into the wider midframe-battery gap for easier access.

Attach a suction handle to the battery, as close to the edge as possible.
Put an opening pick between the battery and frame, with its long edge facing the gap.

Step 26 | Pry up the battery

Do not puncture or bend the battery during removal - risk of chemical leak or thermal event.

Apply more isopropyl alcohol if struggling to remove battery.
Pull up on the suction handle with firm pressure and tilt downwards to pry up the battery.
Use a heavy-duty suction cup as alternative if needed.

Step 27 | Remove the battery

Remove the battery, removing any remaining adhesive.

Wait 10 minutes if using isopropyl alcohol to evaporate completely before installing new battery.

Do not install a damaged or deformed battery, as it poses a safety hazard.

During reassembly:

Secure the new battery with pre-cut adhesive or double-sided tape.
To position correctly, apply adhesive at old adhesive locations, not directly on the battery.
Press the new battery firmly into place.

Temporarily reconnect battery to motherboard for alignment, then disconnect once seated.