Xiaomi Redmi Note 9S Battery Replacement - Xiaomi Redmi Note 9S

Step 1 | Heat the rear glass

Prepare an iOpener by applying it to the back cover for at least two minutes to loosen the adhesive underneath.

An alternative method involves using a hair dryer, heat gun, or hot plate, but take care not to overheat the phone and risk damaging the display and internal battery.

Step 2 | Insert an opening pick

Secure a suction handle to the bottom edge of the rear glass.

If the rear glass is cracked, try lifting it with strong tape or apply superglue to secure the suction handle in place.
Lift the rear glass using the suction handle, creating a small gap between the back cover and frame.

Apply more heat if necessary to soften the adhesive. Be cautious not to overheat (follow iOpener instructions).

Insert an opening pick into the created gap.

Step 3 | Slice the adhesive

Slide the opening pick to the bottom right corner to cut the adhesive.

Leave the opening pick in place to keep the adhesive from re-sealing.

Step 4 | Slice the adhesive

Position a second opening pick at the phone's bottom edge.
Guide the pick towards the bottom left corner to separate the adhesive.

Leave both picks in place to prevent re-adhesion.

Step 5

Reheat the iOpener for one to two minutes if the adhesive becomes hard to cut.

Insert a third opening pick at the bottom left corner of your phone.
Slide the opening pick along the left edge of your phone to slice the adhesive.

Leave the opening pick in the top left corner to prevent resealing of the adhesive.

Step 6

Insert the opening pick under the top left corner of the phone.

Slide the opening pick along the top edge to cut the adhesive.
Leave it in the top right corner to hold open the adhesive.

Step 7

Insert a fifth opening pick under the top right corner.

Slide the pick along the right edge of the rear glass to slice the remaining adhesive.

Step 8 | Remove the rear glass

Remove the rear glass.
Clean affected areas with isopropyl alcohol (90% or higher) before applying new adhesive.
Secure the new rear glass using pre-cut adhesive or double-sided tape.

Apply steady pressure to your phone for several minutes after installation to ensure proper bonding. A stack of heavy books can help.

Step 9 | Unfasten the motherboard cover screws

Remove the motherboard cover using a Phillips screwdriver.

Locate and remove eleven 3.8 mm-long screws, one of which is hidden under an orange sticker.

Step 10 | Pry up the motherboard cover

Locate the right edge of the motherboard cover.

Insert the tip of an opening pick under it.
Pry the cover upwards using a twisting motion with the opening pick.

Step 11 | Remove the motherboard cover

Remove the motherboard cover using either your fingers or a pair of tweezers.

Step 12 | Disconnect the battery cable

Use a spudger to pry the battery flex cable connector straight up out of its socket.

Step 13 | Disconnect the power and volume button cable

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

Avoid folding the cable sharply, as this can cause damage. Gently bend it to the side to free the battery.

Fold the power and volume button cable carefully to the side with your spudger.

Step 14 | Disconnect the display cable

Disconnect the display cable with a spudger, prying the connector straight up from its socket.

Step 15 | Disconnect the motherboard interconnect cable

Disconnect the motherboard interconnect cable using a spudger. Prise the connector straight up from its socket.

Step 16 | Free the battery

Bend cables carefully, avoiding sharp folds, to prevent damage.

Fold the display and motherboard interconnect flex cable towards the charging port.
Keep the cables organized using a small piece of tape on your work surface.

Step 17 | Remove the stretch-release adhesive

Avoid using sharp tools on the battery — risk of puncture and chemical leakage.

Remove the battery adhesive pull-tabs using a pair of blunt nose tweezers or a clean fingernail from the top edge.

Step 18 | Remove the pull-tabs

Grab the first pull-tab with a tweezer or your fingers and slowly pull it towards the phone's bottom edge.

Pull hard enough to maintain tension on the strip, but do not force it.

Avoid pressing down on the battery. Hold the phone firmly by its sides.
Keep the strip flat and unwrinkled, pulling evenly across the whole width.

Do not pry under the battery or press down on it while pulling.

If the adhesive breaks off, try to retrieve it with your fingers or tweezers and continue pulling.
If retrieval is impossible, move on to the next step.

Step 19

Repeat the previous pull-tab removal procedure for the second tab.

Follow the same steps as before: keep the strip flat and unwrinkled, and pull at a low angle.

If adhesive breaks off underneath the battery, apply a few drops of high concentration isopropyl alcohol (over 90%) under the edge of the battery in the affected area.

Wait one minute for the alcohol solution to weaken the adhesive.

Use the flat end of a spudger to gently lift the battery; do not try to force it out. If needed, apply more drops of alcohol to further loosen the adhesive.

Never deform or puncture the battery with your pry tool.

Step 20 | Remove the battery

Remove the battery.

Do not reinstall a damaged or deformed battery, as doing so is a potential safety hazard.

If there's any alcohol solution remaining in the phone, carefully wipe it off or allow it to air dry before installing your new battery.
During reassembly, temporarily reconnect the battery to the motherboard before pressing it into place to ensure correct alignment. Disconnect the battery after it's seated.