How to replace the Apple iPhone 11 battery: guide for professional repair technicians
The Apple iPhone 11 features a Li-Ion battery rated 3110 mAh (11.91 Wh) with a ZIF ribbon connector adhered to the chassis via pull-tab adhesive strips. The display is secured by pentalobe P2 screws and perimeter clips; removal of the LCD panel is not necessary to access the battery, but the procedure requires care to avoid damaging the Face ID and OLED/LCD display flex cables. Average intervention time for an experienced technician is 20–35 minutes; difficulty is medium due to the presence of pull-tab adhesives and the fragility of the battery connector.
Warnings Before You Start
- Discharge the battery below 25% before starting to reduce the risk of swelling or ignition in case of accidental puncture.
- ALWAYS disconnect the battery connector before touching any other connector or logic board component.
- Do not use metal levers in direct contact with the OLED/LCD panel: this risks creating pressure and damaging the display.
- Battery adhesive strips must be extracted slowly and parallel to the chassis plane: yanking them abruptly can break the tab and require heating to remove the cell.
- If the battery is swollen, do not apply heat and treat it as hazardous WEEE waste: dispose of it in accordance with applicable regulations.
Required Parts
Recommended Tools
- Pentalobe P2 screwdriver (iPhone)
- Phillips PH000 screwdriver
- Display opening suction cup
- Plastic spudger / opening plectrum
- ESD anti-static tweezers
- Magnetic screw mat
- Heat gun or iOpener (60–70 °C)
- Isopropyl alcohol ≥90% and cotton swabs
- Pre-cut battery adhesive strips for iPhone 11 (replacement kit)
Step-by-Step Procedure
- 1
Device preparation and discharge
Verify that the residual charge is below 25%. Power off the iPhone 11 completely by holding the side button + volume down until the power-off slider appears. Put on ESD gloves and place the device on an anti-static mat.
💡 Tip: If the device does not power off normally, perform a force restart (volume up → volume down → side button held) and retry powering off. - 2
Removal of pentalobe screws and display opening
Remove the two pentalobe P2 screws (3.1 mm) positioned at the sides of the Lightning connector. Apply the suction cup to the lower display area, pull upward while keeping the phone steady, then insert a plastic plectrum in the gap created along the bottom edge. Slide the plectrum along the left and right sides without touching the upper edge where the Face ID flex cables are located.
💡 Tip: If the gap is difficult to create, heat the lower edge with hot air at 60–65 °C for 30–40 seconds to soften the IP68 waterproof seal. - 3
Book-style display opening
Open the panel like a book toward the left (left edge as hinge), tilting it no more than 90°. DO NOT open toward the upper edge: the display and Face ID flat cables are located on the right/upper side and have limited length. Rest the display on a support or hold it open with a dedicated holder.
💡 Tip: A magnetic display holder at 90° reduces the risk of accidental flex cable damage during subsequent operations. - 4
Cover removal and battery disconnection
Locate the metal battery connector cover (lower left corner of the logic board, secured by two Phillips PH000 screws, 1.6 mm). Remove the screws and keep them on the magnetic mat, lift the plate with the spudger. Insert the spudger under the battery ZIF connector and gently pry upward from the edge until it disengages. Do not pull vertically: the connector is fragile.
💡 Tip: Photograph the position of screws and covers before removal to facilitate reassembly. - 5
Display connector disconnection
Remove the metal cover protecting the display connectors (3 Phillips PH000 screws, different lengths – note the position). Disconnect in order: digitizer connector, LCD/OLED connector, upper front connector (Face ID / front camera) using the spudger with an upward lever motion from the connector edge. This step is necessary to safely place the display during battery replacement.
💡 Tip: If you prefer to keep the display connected, use the 90° holder and proceed with caution: the risk of accidental cable damage increases. - 6
Removal of adhesive strips and battery
iPhone 11 typically uses two pull-tab adhesive strips under the battery. Locate the white/transparent tabs protruding from the lower edge of the battery. Grip one tab with tweezers, keep it parallel to the chassis plane, and pull slowly toward the Lightning connector (horizontal direction). Repeat with the second tab. If the strips break, apply a few drops of isopropyl alcohol ≥90% to the battery edges, wait 30–60 seconds, and use a plastic spudger to gently pry from the lower edge. Alternatively, heat the back of the chassis to 50–55 °C to soften the residual adhesive.
💡 Tip: Never use brute force: the battery sits above the lower logic board and deformation can cause short circuits. - 7
Chassis inspection and cleaning
Using a cotton swab soaked in isopropyl alcohol ≥90%, remove adhesive residue from the battery compartment and metal frame. Verify the absence of damage to the FPC connector on the logic board, check the contact pins of the battery connector. Inspect the perimeter seal of the display: if damaged, replace it to restore the IP68 rating.
💡 Tip: Allow the alcohol to completely evaporate (1–2 minutes) before proceeding with assembly. - 8
New battery installation
Apply the new pre-cut adhesive strips for iPhone 11 to the battery compartment (or use the kit included with the InParts battery). Remove the protective film from only one side of the adhesives, position the battery aligning it correctly with the connector facing upward to the right. Press firmly for 30 seconds to activate the adhesive. Do not yet remove the pull-tabs of the new battery: they remain for future repairs.
💡 Tip: Verify that the battery connector is positioned exactly above the ZIF socket before pressing the cell into place. - 9
Battery connector connection and verification
Reconnect the battery ZIF connector by gently pressing with the spudger until you hear a click. Remount the metal cover plate and the two Phillips screws (1.6 mm). Before closing the display, briefly power on the device to verify it starts correctly (the display must illuminate without artifacts).
💡 Tip: If the device does not power on, disconnect and reconnect the battery connector: this often resolves suboptimal contact. - 10
Display reconnection and closure
Reconnect in reverse order: upper front connector, LCD/OLED connector, digitizer connector. Remount the connector cover plate with the three Phillips screws (respecting the original lengths). Align the display to the chassis starting from the upper edge, press gently along the edges until the clips snap into place. Remount the two pentalobe P2 screws on the lower edge.
💡 Tip: Press the display from the corners toward the center to ensure uniform engagement of the perimeter clips. - 11
Final testing and battery calibration
Power on the device and verify: touch response in every screen zone, Face ID functionality, speaker audio, front and rear camera, and displayed battery percentage. In Settings, check battery status (Settings > Battery > Battery Health): on iOS 16+ the message 'Unable to Verify' may appear if using a non-MFi certified cell. Inform the customer and charge the device to 100%, fully discharge it, and recharge to calibrate the BMS.
💡 Tip: On iOS 15.2+ Apple introduced verification of serial pairing between battery and board: use OEM/compatible quality batteries to minimize status message alerts.
Frequently Asked Questions
After replacement, the message 'Battery Health Not Available' appears on iPhone 11: is this normal?
On iOS 14.5+ and later, Apple introduced a verification system via battery authentication chip. If a non-original Apple battery or one not paired through the official process (reserved for AASP centers) is used, the message 'Unable to Verify' will appear. This does not affect battery functionality, but the customer will not be able to see the health percentage in the dedicated screen. Always inform the customer before the service.
The adhesive strips broke during removal: how to proceed?
Apply a few drops of isopropyl alcohol ≥90% along the battery edges and wait 60–90 seconds to dissolve the residual adhesive. Alternatively, heat the back of the chassis (in the battery area) with hot air at 50–55 °C for 1–2 minutes. Then use a thin plastic spudger to pry from the lower edge with slow, progressive movements. Absolutely avoid using sharp metal objects that could puncture the cell.
Is it necessary to calibrate the new iPhone 11 battery after replacement?
Yes, it is recommended. The BMS (Battery Management System) requires a complete cycle to register the actual capacity of the new cell. Recommended procedure: charge to 100% without interruption, use the device until automatic shutdown, then recharge to 100%. This cycle helps obtain a more accurate reading of the residual percentage.
Does the iPhone 11 maintain the IP68 certification after battery replacement?
No, battery replacement compromises the original perimeter seal. To restore water resistance, apply a new adhesive perimeter seal to the display and/or frame before closing. Always inform the customer that IP68 resistance is not guaranteed after third-party service.
What capacity should the replacement battery have for iPhone 11?
The original iPhone 11 battery has a capacity of 3110 mAh (11.91 Wh) with a nominal voltage of 3.83 V. Ensure the replacement battery meets these specifications and that the ZIF connector is compatible with the original socket. Use batteries with CE certification and preferably with integrated NTC chip for proper thermal management.
All Apple Spare Parts in Stock
20,000+ spare parts available, 24/48h shipping in Europe. Reserved B2B prices and no minimum order.