Samsung Galaxy S8 Battery Replacement
A charged lithium-ion battery can catch fire and/or explode if accidentally punctured.
- Discharge the battery below 25% before disassembling your phone.
- If your battery is swollen, exercise caution:
- Do not heat your phone or use flames near it.
- Wear eye protection and consider using a dropper or syringe with isopropyl alcohol (90+%) to weaken the adhesive on the back cover, if needed.
Step 1 | iOpener Heating
Clean the microwave thoroughly before proceeding to avoid gunk adhering to the iOpener.
- Place the iOpener in the center of the microwave.
- For carousel microwaves: Ensure the plate spins freely to prevent overheating and damage to the iOpener.
Step 2
Never attempt to heat above 100°C (212°F).
- barely too hot to touch, indicating sufficient heating time.
- Reheat in the microwave for an additional 30 seconds as needed throughout the repair.
- Do not overheat, which may cause the iOpener to burst.
Never touch a swollen iOpener.
Continue using an excessively hot iOpener while it cools down, but avoid prolonged exposure above 100°C (212°F).
A properly heated iOpener will stay warm for up to 10 minutes.
Step 3
The iOpener will be extremely hot after microwaving, handle with care.
- Remove the iOpener from the microwave.
- Use one of the flat ends to avoid touching the hot center.
- Wear an oven mitt if extra protection is needed.
Step 4 | Alternate iOpener heating method
Caution: The iOpener will be extremely hot after heating.
- Fill a pot or pan with enough boiling water to fully submerge an iOpener.
- Turn off the heat and place an iOpener into the water for 2-3 minutes, ensuring it's fully submerged.
- Use tongs to carefully remove the heated iOpener from the hot water.
- Dry the iOpener thoroughly with a towel before handling.
When reheating, repeat these steps: heat boiling water, turn off heat, and submerge the iOpener for 2-3 minutes.
Step 5 | Back Glass Assembly
Opening your phone will compromise its waterproof seals; have replacement adhesive ready or take precautions against liquid exposure.
- Heat an iOpener for 2 minutes on a long edge of the S8, reheating and reapplying as necessary to achieve a softening effect.
- Avoid overheating by following the iOpener instructions; alternative heat sources like a hair dryer, heat gun, or hot plate may be used with caution.
While waiting for the adhesive to soften, proceed to the next step to plan your prying approach.
Step 6
Prying into thin adhesive areas can cause damage to the device.
- Identify thick and thin adhesive areas around the rear glass panel.
- Avoid prying near the fingerprint sensor.
- Apply the prying pattern as seen from the outside of the phone:
- Pry on thick adhesive portions first.
- Separate adhesive areas carefully, working around the edge.
Step 7
Apply a suction cup near the heated edge, avoiding the curved edge.
- Wait until the back panel is warm to the touch before proceeding.
- If the back cover is cracked, use strong tape or superglue to secure the suction cup.
The suction cup may not seal on curved glass.
- Place an opening pick under the rear glass as you lift the phone.
- Due to curved glass, push up instead of inserting parallel to the phone's surface.
Step 8
Reheat and reapply the iOpener to soften the adhesive.
- Ensure the tool is still firmly inserted into the glass.
Step 9
Slide a precision plastic spudger along the phone's edge, carefully prying up the adhesive.
- Move the tool slowly to maintain control.
- If cutting becomes difficult, reheat and reapply the iOpener.
Step 10
Continue heating and cutting process for remaining three sides.
- Leave an opening pick on each side before moving to the next.
Step 11
Do not open further if the fingerprint sensor cable stays taut.
- As you lift the rear glass, verify that the orange cable with a blue connector has disconnected.
- Use opening picks to carefully slice through remaining adhesive and open the phone slightly.
Do not proceed if the fingerprint sensor cable seems snagged; instead, use a spudger to gently disconnect the connector.
- During reassembly, angle the back cover into position until the cable connector lines up with its socket.
- Use the flat end of a spudger to snap the connector into place by pressing straight down.
Remove the rear glass from the phone.
Step 12
Use tweezers to remove remaining adhesive from phone chassis.
- Clean adhesion areas with high concentration isopropyl alcohol (at least 90%) and lint-free cloth.
- Peel backing off new rear glass, align one edge with phone chassis, and press firmly into place.
Turn on phone and test repair before applying new adhesive.
- To install without adhesive, remove large chunks of existing adhesive and secure back cover with heat and pressure.
- Transfer camera bezel if necessary; follow camera bezel replacement guide for details.
Step 13 | NFC Antenna and Charging Coil Assembly
Remove the eleven 3.7 mm screws with a Phillips #000 screwdriver.
Step 14
Disconnect the NFC antenna and charging coil assembly from the motherboard.
- Use a plastic spudger to carefully pry it loose.
- Set it aside, taking care not to damage any surrounding components.
Step 15 | Loudspeaker Assembly
- Remove three Phillips #000 screws, each with a diameter of 3.7 mm.
Step 16
Remove the loudspeaker assembly.
Step 17 | Battery
Disconnect the battery connector with the flat end of a spudger.
Step 18
Apply 1-2 drops of high-concentration isopropyl alcohol under each corner of the battery, allowing it to penetrate for several minutes.
- This will help loosen the adhesive designed for use with isopropyl alcohol.
- Be careful not to use too much, as this can damage the display.
Step 19
Do not use excessive force or metal tools — risk of damaging the daughterboard and antenna cables or deforming the battery.
- Apply firm, constant pressure to the battery using an opening pick.
- Pry against the case directly above the daughterboard and antenna cables.
Be cautious not to deform the battery, as this may cause leaks or fires from soft-shell lithium-ion batteries.
Step 20
Slide opening pick up side of battery to break remaining adhesive.
- Lift battery out of case.
Do not reuse removed battery — potential safety hazard.
- Replace with new battery.
If using isopropyl alcohol, wait ten minutes for evaporation before installing new battery.
- Follow this guide to install new battery and adhesive.