Is your iPhone 15 Plus losing its charge too quickly or running slower than usual? It might be time for a battery replacement.
In this guide, we will walk you through the steps to replace the battery in your iPhone 15. iPhone batteries are built to last up to 500 charge cycles. And it typically gives you the best battery life for 18-24 months. If your phone isn’t holding a charge like it used to replacing the battery can give it new life.
For this repair you will need a replacement battery and adhesive for the back glass. If your battery is swollen be sure to handle it with care. Also keep in mind that due to Apple’s parts pairing restrictions, you may see warnings about the replacement and lose access to battery health data. But don’t worry—your new battery will still work perfectly fine!
Step #1. Gathering Essential Tools
Before you begin, make sure you have all the necessary tools. This will help you complete the repair smoothly. Here’s what you’ll need:
*A Replacement Battery For Your Iphone 15 Plus.
*The back glass adhesive will seal the phone Afterwards.
*A Pentalobe (P2) Screwdriver Is Used To Remove The Screws At The Bottom.
*Hair Dryer Or Heat Gun.
*Opening Picks.
*Tri‑point Y000 Screwdriver.
*A Suction Cup Or Strong Tape To Lift The Screen.
*A Spudger Or Opening Tool To Pry Open The Phone.
*Isopropyl Alcohol.
*Microfiber Cleaning Cloths.
*ESD Safe Blunt Nose Tweezers.
*Tweezers For Handling Small Parts.
*A Hairdryer Or Heat Gun To Soften The Adhesive.
Having everything ready will make the process much easier!
Step #2. Preparing Area For iPhone 15 Plus Battery Replacement
Find a clean and flat surface to work on. Make sure the area is well-lit so you can see small parts easily. Avoid working near any liquids or dust that could get inside the phone.
Place a soft cloth or mat on the surface to protect your iPhone from scratches. Keep all your tools within reach to stay organized. If possible wear an anti-static wrist strap to protect your phone’s internal components from static electricity.
Having a well-prepared space will help make the repair process smoother and safer.
Step #3. Switch Off the Phone
*Before starting the disassembling process you have to make sure that the phone is not connected with any wire.
*Next, you have to check the battery status. If the battery is more than 25% charged, you have to wait to drain it. A more than 25% charged battery has lithium-ion that can immediately catch fire if accidentally damaged.
*Then you will switch off the phone and disassemble it.
How to Switch Off iPhone 15 Plus
*Press the top volume button on the side of your iPhone 15 Plus.
*While holding the volume button, press and hold the Side button as well.
*Keep holding both buttons until the power off icon appears on the screen.
*Once the icon appears, tap and drag the power off slider from left to right to turn off your iPhone.
Step #4. Remove The Pentalobe Screws
*Well now we are opening its screws.
*First of all we have to remove the pentalobe screws.
*Here you will use the P2 pentalobe driver for unfastening the two screws.
*Please carefully place the screws after removing them. You have to fasten these screws when reassembling.
*These crews are 7.7 mm long and located on two sides of the USB-C charging jack.
Step #5. Give Heat to the Bottom Edge of the iPhone 15 Plus Back Glass
*Now you need to apply heat on the bottom edge of the iPhone 15 plus back glass.
*Heat the adhesive with a heat gun, hair dryer, or hot plate.
*Please be careful while heating. Not to give excessive heat because the battery is susceptible to heat damage.
*Well keep checking the warmth by touching it with your hands. When you feel it is too hot to touch stop heating the phone.
Precautions
*If your phone’s screen or back glass is badly cracked, put layers of packing tape over it. This protects your hands from sharp edges and makes it easier to take apart.
*Make sure there’s a smooth area near the bottom of the phone where a suction cup can stick. This will help you lift the glass more efficiently during the repair process.
Step #6. Place Suction Handle
*After heating you have to apply a Suction tool to the bottom of the iPhone 15 Plus’s back glass, but quickly.
*Pull the handle of the Suction tool to create a line gap for the opening pick’s insertion.
*Please apply strong and steady force so that you can avoid any hassle.
Step #7. Insert Opening Pick
*When you see a line gap between the back glass and frame it means the opening pick is ready to be inserted.
*Insert an opening pick into the gap.
Precautions
*Be careful not to insert the opening pick too far as this can damage your device. To avoid this you should mark your pick to know the safe depth.
*Start by measuring 3 mm from the tip of the opening pick and make a mark with a permanent marker. This mark will help you know how far to insert the pick without causing harm.
*You can also mark the other edges of the pick with different measurements to help with different parts of the repair.
*Another option is to tape a small coin to the pick 3 mm from the tip to stop it from going too deep.
Step #8. Separate The Bottom Edge Adhesive
*Now move the opening pick to cut the adhesive from the bottom edge of the iPhone.
*Here you have the option to leave the pick to prevent the bottom edge from resealing again.
*Please be cautious while inserting the opening pick as it does not go in more than 5 mm long.
*Try to leave the pick on the bottom right edge of the back Glass. Because we will continue cutting the adhesive from the right edges.
Step #9. Heat the Right Edge of the iPhone 15 Plus
*Again pick a heat gun, hair dryer or whatever tool you are using for heating purposes.
*Give heat to the right edges of the phone.
*Keep checking the back glass until it gets too hot to touch.
Step #10. Insert Second Opening Pick
*Now insert the second opening pick just next to the first one.
*Move it gently from the bottom corner towards the right edges
*Keep sliding the pick to separate the adhesive between the back glass and the frame until you feel a strong stop at the clip in the middle of the back glass.
*Don’t insert the pick more than 7 mm long while cutting the right edges adhesive.
*Stop cutting the adhesive near the volume button and leave the opening pick here.
Be Aware About The Screen Cables
*Be careful when cutting through the adhesive holding the back glass, as some areas are sensitive and can be easily damaged.
*A thin cable connects the phone’s back glass to the volume-up button near the volume-up button. To avoid cutting the cable do not insert the pick too close to this spot.
*There are spring contacts around the edges of the phone. Do not push the pick too deep as it can bend or damage them. Always follow the steps closely to avoid any issues.
Step #11. Heating Left Edge Adhesive and Separate
*App heat on the left edge of the back glass.
*After heating move the opening pick that is interested in the bottom edge of the iPhone.
*Move it toward the left edge.
*Keep sliding the pick towards the top edge corner.
*Leave the pick inserted to prevent re-sealing.
Step #12. Give heat to the Top Edge Of The iPhone 15 Plus
*Now the last edge for opening the back glass is its top edge.
*Apply heat properly as we suggested above, and then move the opening pick from the phone’s left edge.
*Rotate the pick carefully and cut the adhesive in the top left corner.
*Feel the click sound as the top edge has two securing clips.
*Please don’t insert the pick deeper than 3 mm long inside.
*Well at this time you are on the top right edge. All the sides are separated except for the volume button on the top right edge.
*Here you have to apply more heat for a while. Now rotate the pick carefully from the top right corner.
*Gently slide it toward the volume keys and gently twist the pick near them.
*Don’t insert the opening pick over 4 mm long near the volume button.
Step #13. Open The Back Glass
*Gently open the back glass from the left side and swing to the right side.
*The back glass will not be separate at this stage cause it is still cable-connected.
*If you feel stuck at any spot, don’t try harder. You need to cut the adhesive using an opening pick. Maybe this is the securing clip so you can twist the pick up and down until the clip is released.
*Place a box or something similar to rest the back glass to avoid straining cables.
Step #14. Unfasten The Lower Connector Cover Screws & Remove
*Use a tri-point Y000 screwdriver to take out the two screws that are 1.3 mm long. These screws hold the lower connector cover in place. And it’s important to carefully remove them for proper reassembly later.
*During the repair it is important to keep track of each screw you remove. Make sure to place them in an organized way and remember where each one goes so you can put them back in their original spots.
*Now use a tweezer to slide the cover toward the top of the phone. Feel unlatching it from the logic board.
*Remove the cover
Step #15. Disconnect The Battery Press Connector
When we replace any part of the phone we have to disconnect the battery as soon as we can.
For the iPhone 15 Plus battery replacement, we can disconnect the battery at this stage.
*Hold the back glass in an upright position with one hand and gently rotate the bottom part to the left. This will expose the battery press connector which is located just under the volume buttons.
*Take the tip of an opening pick and carefully pry up the battery press connector from the logic board to disconnect it.
*You’ll notice a plus (+) and minus (-) sign printed on the top of this connector, which helps identify its orientation.
Step #16. Unfasten The Middle Connector Cover
*Grab your tri-point Y000 screwdriver and remove the 0.9 mm screw that holds the middle connector cover in place.
*Using the flat end of a spudger or simply your finger gently push the cover toward the bottom of the phone to unclip it from the top edge.
*Once it is unclipped carefully lift it and remove the cover to expose the components under this cover.
Step #17. Disconnect the Wireless Charging Coil And NFC Antenna
*This step is for finally removing the back glass from the phone.
*You can use that opening pick prying up the charging coil press connector and NFC antenna.
*Disconnect them from the board.
*Now free up the back glass of the iPhone 15 Plus.
Step #18. Separate The Battery Cable
*The battery cable is lightly secured to the logic board with adhesive.
*Gently slide an opening pick underneath the battery cable to separate it from the logic board.
*Be cautious not to bend the cable or accidentally press too hard on the battery to avoid causing any damage.
Step #19. Peel Up A Corner Of The Pull Tabs
*Two stretchy adhesive strips hold the battery in place on your iPhone 15 Plus. The next steps will show you how to remove them and remove the battery.
*Be careful not to dent or poke the battery. Also avoid using sharp tools near it.
*Use the tip of an opening pick to peel the edge of each stretchy pull tab at the top of the battery.
*Keep lifting until you can grab the tab with a pair of tweezers.
*Please use a blunt nose tweezer to grip and peel the pull tabs.
*Peel it from the battery.
*Now do the same with another pull tab.
Step #20. Free The Top Edge Of The Battery
*The stretchy adhesive goes around the top edge of the battery so you will need to separate it before you can fully remove the strips.
*Use tweezers to carefully hold one of the pull tabs away from the battery.
*Take an opening pick and cut through the adhesive holding the strip to the top edge of the battery.
*Do the same for the other pull tab.
Step #21. Remove The Stretch Release Adhesive
*Use your blunt tweezers to grab the whole length of the pull tab on one of the adhesive strips.
*Twist the tweezers to roll the adhesive strip over itself and pull it out slowly. Keep it even and low to the surface as you pull it from under the battery.
*Let the strip stretch fully as you pull. Don’t drag it over any cables or parts inside the phone.
*If you are using your fingers, please re-grip the strip often so it doesn’t stretch unevenly or tear.
*Repeat these steps for the other strip too.
*If a strip breaks try to get it from under the battery. If you can’t reach it, don’t worry! You can move on to the next step for another way to remove the battery.
Step #22. Alternative Way To Remove The Battery
*You have done a great job if you have removed both adhesive strips! You can now take out the battery. But if not! You have to follow the next points (steps) using isopropyl alcohol and a plastic card to remove the battery.
*First prop up the right side of your phone (where the volume buttons are).
*Use a pipette or syringe to apply a few drops of 90% or higher isopropyl alcohol to the inside edge of the battery.
*Now prop up the phone’s top edge and repeat by applying isopropyl alcohol to the battery’s upper edge.
*Wait for one minute to let the alcohol seep in and loosen the adhesive under the battery.
*Be gentle with the battery. Don’t bend or fold it. If it is still stuck, add a few more drops of isopropyl alcohol and try again.
*Slide the long edge of a plastic card between the left side of the battery and the phone frame.
*Hold the phone steady and gently pry the battery upward. Depending on the adhesive is strength, this might take a little time. Apply pressure for up to a minute if needed.
*Keep sliding the plastic card under the battery until you can lift it up.
*Once the battery is loose lift it with your fingers and carefully remove it from the phone.
Now the reassembling process will start from the next steps.
Step #23. Replace the iPhone 15 Plus Battery
*Now we are on the verge of an iPhone 15 Plus Battery replacement.
*Take out the new battery from its packing.
*Clean the phone’s frame using isopropyl alcohol and a lint-free or microfiber cloth to remove any leftover adhesive or dust. This will make sure a smooth surface for the new adhesive.
*Before adding any adhesive you need to temporarily connect the new battery to the phone. Place the battery in its spot to make sure it fits properly and that the battery cable reaches the socket on the logic board.
*After checking the fit please disconnect the battery before moving forward with the rest of the steps.
*The replacement battery will come with the pre-installed adhesive. If in your case you have only a battery without stretch-release adhesive you can apply thin, double-sided tape to secure it.
*Otherwise follow next “How To Install Stretch-Release Adhesive. “
How To Install Stretch-Release Battery Adhesive
*First of all please note where the old adhesive was located. It will help you to get a quick idea about applying the new stretch-release adhesive.
*Make sure the surface is clean when applying the stretch-release adhesive.
*Apply the adhesive to the back side of the replacement battery. If you feel it is a little too long for the battery, you can cut it to make the proper length. To cut, you have to measure and mark the strip.
*Firstly remove the small sections of blue film covering the ends of the adhesive strips. Please don’t remove the entire blue liner—just the parts covering the pull tabs.
*Next is carefully align the exposed portions of the adhesive strips along the edge of the front side of the battery and press them gently into place. Some devices have the battery pull tabs near the top, while others place them near the bottom, so check which position works for your iPhone 15 Plus.
*It’s important to get the alignment right the first time because once the adhesive strips stick to the battery, they can’t be moved or adjusted.
*Now place the battery face down on a flat surface. Starting at the cut end of the adhesive strips peel off the large blue film that covers the strips. If you have trouble starting the peel near the cut section you can use tweezers to help lift the blue layer.
*With the adhesive strips exposed use your fingertip to gently roll them over the bottom edge of the battery. You are also moving toward the back. Make sure not to pull or stretch the strips as you apply them. Lay the strips flat on the back of the battery and use your fingers or a cloth to press them down firmly.
*Carefully remove the remaining piece of blue film to fully expose the adhesive strips. Then lightly place the battery in the phone.
*Temporarily plug in the battery connector to check if the cable reaches the socket. But make sure to disconnect the battery before you continue with the reassembly.
*Finally press the battery into place and proceed with the further reassembling.
Precautions
*Be careful not to apply adhesive over ribbon cables or delicate parts such as NFC or wireless charging coils. Also try not to place the adhesive too close to sensitive components that could be damaged.
*When cutting the adhesive strips make sure your scissors are sharp. Dull scissors can make the adhesive sticky and messy. It might force you to start with new strips.
*If the blue film is defective and doesn’t peel off properly you may need to discard the strips and use new ones.
Step #24. Test Your Repair
*After battery installation we can move on to reassemble the back glass.
*It’s a good idea to test your repair before you fully seal your phone.
*Reconnect the battery and the back glass temporarily then turn on your phone to check if everything is working correctly.
*Once you have confirmed that it is working as expected turn off the phone and put everything back together.
*To reassemble the back glass of the iPhone 15 Plus you will have to install a new adhesive.
*Before doing anything else like connecting the cables or placing the covers you need to install new adhesive.
*For this first of all please make sure the edges of the phone and the back glass are perfectly clean.
*Otherwise please remove old adhesive by scrubbing with the pointed tip spudger or peel using a tweezer.
*You can also use isophyle Alcohol and rubbing with the lint-free cloth.
*Start by positioning the replacement adhesive over the phone’s frame. The larger blue liner should be on the underside with the pull tab located in the bottom right corner.
*Use features like the camera cutout and the notches along the top and bottom edges to help you visualize how the adhesive should fit into the frame.
*Gently pull back the blue liner using the pull tab to expose just the bottom edge of the adhesive. Keep the blue liner lifted out of the way as you align the adhesive with the bottom edge of the iPhone 15 Plus.
*Place the bottom edge of the adhesive into its spot in the frame. You need to make sure that the iPhone’s spring contacts are properly lined up with the cutouts in the liner.
*As you work your way up apply the adhesive along the sides of the phone. Now peel the blue liner back as you go. If the adhesive isn’t perfectly straight gently adjust the long edges to align with the frame.
*Double-check that the notches along the top edge match up with the frame. Slowly press the top edge of the adhesive into place and carefully peel off the rest of the blue liner.
*Use the flat end of a spudger tool to press the adhesive firmly along the perimeter of the frame but be careful not to touch the spring contacts sticking through the pink liner.
*Finally use the small pull tab in the top right corner to remove the pink liner from the adhesive.
Step #25. How to Replace iPhone 15 Plus Rear Glass Adhesive
Step #26. Reassembling the Back Glass
*Now connect the charging coil and press the cable connector.
*For this you need to prop the back glass of the iPhone and set it with the box or something similar to the box.
*Use a flat-tip spudger to press the charging coil cable. You do it with your fingers too.
*Attach the charging coil connector cover by aligning it with the slot or hook on the logic board.
*Position the cover so that its tab sits just behind the clip on the logic board. Hold it down with one finger, then gently slide the cover forward until it locks into the clip.
*Use a tri-point Y000 screwdriver to insert the screw and secure the cover in place.
Step #27. Connect the Battery Press Connector
*Use the flat end of a spudger or your finger to reconnect the battery.
*Attach the battery connector cover by hooking it into its slot on the logic board.
*Then use a tri-point Y000 screwdriver to insert the screws and secure the cover in place.
Step #28. Remove The Final Adhesive Liners
*Peel off the liners from the top, left, and bottom edges of your iPhone, but hold off on removing the one on the right edge.
*As you take off each liner make sure that nothing comes into contact with the exposed adhesive.
*Raise the rear glass slightly so you can reach the last liner on the right side.
*Carefully peel away the final liner, being cautious not to snag any cables or clips attached to the rear glass.
Step #29. Install the Rear Glass of the iPhone 15 Plus
*Remember that there are hooks. If any of the clips on the rear glass are bent carefully straighten them using your fingers.
*Position the rear glass over the frame and align it properly.
*Gently place the top edge of the rear glass onto the frame. Please make sure the top clips click into place.
*Press along the edges of the rear glass to secure the rest of the clips around the perimeter.
*Fasten pentalobe screws.
Step #30. Turn On the iPhone 15 Plus
*Hold the Side button until your iPhone powers on.
*Slide your finger upwards from the bottom of the screen to unlock the phone.
*If your SIM is locked, enter your PIN code.
*After making sure the PIN is correct, press “OK” to confirm and access the phone.
*Now charge and check everything on your phone.
*When you charge your phone, please note the time it takes to charge fully.
*Then note the battery’s backup time when you fully use your phone.
Congratulations!
Finally your iPhone 15 Plus Battery Replacement has been completed now. We hope that this is helpful and that everything went perfectly on your side too. This guide also shows you very clear steps for installing new adhesives for the battery pull tabs and back glass adhesive. Ask your question and give us suggestions in the comment section or you can Email us. Best of luck!
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