How to Change an iPhone 11 Battery Safely

Replacing the battery can restore runtime when the existing battery no longer holds a useful charge. This guide is for an experienced DIY repairer: opening the iPhone 11 can compromise its water resistance, and a punctured or bent lithium-ion battery can catch fire. Back up the phone first. If you are unsure about handling the battery or delicate display cables, use Apple or a qualified repair provider instead.

What You’ll Need

A compatible iPhone 11 replacement battery with new adhesive strips; choose a reputable part intended for this exact model.
Pentalobe P2 screwdriver for the two bottom screws, a tri-point Y000 screwdriver, and a Phillips screwdriver for the internal screws.
Small suction handle, plastic opening picks, and a plastic spudger. Avoid metal tools near the battery and connectors.
Heat source controlled for electronics, such as a repair heating pad, plus eye protection and a clean, well-lit workspace.
Isopropyl alcohol appropriate for electronics and tweezers for removing stubborn adhesive, if needed. Keep liquid away from the phone interior and battery.
A screw organizer or labeled tray. The screws are different sizes; putting one in the wrong hole can damage the phone.

Step-by-Step

Back up and prepare. Back up important data, turn off the iPhone, and unplug all cables. Let the battery run down to below 25% before opening; a lower-charge battery is less hazardous if accidentally damaged. Remove the case and SIM tray. Work on a dry, uncluttered surface, and keep the replacement battery’s protective liner in place until needed.
Remove the bottom screws. Use a P2 pentalobe driver to remove the two screws beside the Lightning port. Keep them labeled and separate from every other screw. Do not force a driver that does not fit snugly.
Soften the display adhesive. Apply controlled, gentle heat around the lower edge of the display to soften its adhesive. The screen should be warm, not too hot to touch. Do not overheat one spot or direct heat at the battery. If the display is cracked, cover it with suitable repair tape before using suction to reduce the risk of loose glass.
Lift and open the display. Place a suction handle near the bottom edge and pull gently while working a thin plastic pick into the seam. Slide the pick along the lower edge and sides only enough to cut adhesive; do not insert it deeply. Avoid the right edge, where display cables are located. Open the screen from the left like a book, keeping it supported and attached. Never pull it straight away from the phone.
Disconnect the battery first. Remove the shield covering the battery connector, keeping track of the screw positions. Lift the battery connector straight up with a plastic spudger. Do not pry against nearby components. Once disconnected, avoid powering the phone or touching exposed connector contacts with metal.
Disconnect and remove the display. Remove the relevant connector shields and screws, recording their exact positions. Use a plastic tool to disconnect the display and sensor connectors, lifting each connector by its edge. Keep the display supported and set it on a clean, safe surface. Do not touch or bend the delicate cable ends.
Release the old battery. Locate the battery adhesive pull tabs and draw them out slowly, low and flat, keeping steady tension. Do not yank upward. If a strip breaks, do not lever against or puncture the battery. Use only a small amount of suitable isopropyl alcohol at the edge of the battery adhesive if needed, keeping it away from connectors and allowing it to evaporate fully. If the battery bends, swells, hisses, smells unusual, or becomes hot, stop immediately and move away from it; do not continue the repair.
Install and connect the replacement. Check the new battery for damage and confirm the connector matches. Fit fresh adhesive strips in the correct position, following the part’s instructions, then place the battery without bending it. Reconnect the display and sensor cables carefully, followed by the battery connector. Connectors should align and press into place without force. Refit each shield and screw in its original position.
Test, reseal, and close. Before applying new display adhesive, power on the phone and check the screen, touch response, cameras, speakers, buttons, and charging. If anything fails, power off and recheck the relevant connector. Turn the phone off again, remove old display adhesive, and apply a replacement seal made for iPhone 11. Close the display carefully, press around the edges, and reinstall the two bottom screws. A new seal does not guarantee the original water resistance; avoid exposing the repaired phone to moisture.

Common Mistakes

Pulling the screen too far: The display cables are short and can tear. Open the display like a book and support it throughout the repair.
Using metal tools on connectors or the battery: This can cause a short or puncture. Use plastic tools and lift connectors straight up.
Mixing up screws: Different lengths may look similar. Keep each screw with its shield and location; a misplaced screw can damage internal parts.
Forcing a connector: If it will not seat with gentle, even pressure, remove it, check alignment, and try again. Never press a connector down at an angle.
Reusing stretched adhesive or skipping the seal: Old battery strips may not hold, and old display adhesive is not a reliable seal. Use fresh, correctly sized adhesive.
Continuing with a swollen or damaged battery: Do not press, heat, bend, or puncture it. Stop and arrange safe professional handling.

Tips

Take a photo at each stage and label screw locations before removing shields.
Use the correct driver size and keep its tip seated to avoid stripping screw heads.
Keep heat modest and localized. If adhesive resists, warm it again rather than increasing force.
Test the phone before sealing it shut; reopening a freshly resealed display can damage the new adhesive.
Dispose of the old battery through an approved battery recycling or electronics collection service. Do not put it in household rubbish.
After replacement, check Settings > Battery > Battery Health & Charging; menu wording may differ slightly by iOS version. A replacement part may not show the same battery information as an Apple-installed part.

Troubleshooting

The display will not lift: Recheck that both bottom screws are removed. Apply gentle heat again and work a plastic pick into the seam. Do not twist a metal blade into the gap.
An adhesive strip snaps: Stop pulling and avoid prying beneath the battery. Carefully use a small amount of suitable isopropyl alcohol to loosen the adhesive, keeping it away from the phone’s connectors. If the battery will not release without force, seek professional repair.
The phone will not turn on: Disconnect power, reopen the phone if safe, and check that the battery connector is aligned and fully seated. Inspect for bent pins or debris. Do not repeatedly press or force the connector.
The screen is blank or touch does not work: Power off and inspect the display and sensor connectors for correct alignment or damage. Reseat them gently. If a cable is torn or a connector is damaged, stop and get qualified help.
The phone heats up, smells unusual, or the battery swells: Stop using and charging it. Do not press the display closed or attempt another repair. Keep away from the device and arrange professional help for safe handling.
Battery information or charging seems wrong: Confirm the battery is the correct model and its connector is seated. Try a known-good cable and adapter. If the issue remains, the battery or another component may be faulty; have it inspected rather than continuing to open the phone.

Frequently Asked Questions

Can I change an iPhone 11 battery myself?

Yes, if you have suitable tools and repair experience, but it is an advanced repair involving fragile cables and a hazardous battery. Choose professional service if you are not comfortable with those risks.

How long does the repair take?

Allow about 90 minutes for a careful repair, including testing. A stuck adhesive strip or unfamiliar screw layout can take longer.

Will replacing the battery restore water resistance?

Do not assume so. Opening the phone breaks its original seal, and replacement adhesive cannot guarantee the factory water-resistance performance.

Will I lose my data?

A battery replacement should not erase data, but accidental damage or another fault can prevent access. Back up the iPhone before starting.

What should I do with the old battery?

Keep it away from heat and sharp objects, and take it to an approved battery recycling or electronics collection point. Do not place it in household rubbish.

Sources: Apple Support. Menus and buttons can differ slightly by version. Spotted something out of date? Tell us.