Use this guide to replace the worn-out battery in your Samsung Galaxy S8.

This guide involves removing the rear glass cover, you will need replacement adhesive to reattach the back cover of the phone.

Before disassembling you phone, discharge the battery below 25%. the battery can catch fire and/or explode if accidentally punctured, but chances of that happening are much lower if discharged.

If your battery is swollen, do not heat your phone. If needed, you can use a dropper or syringe to inject isopropyl alcohol (90+%) around the edges of the back cover to weaken the adhesive. Swollen batteries can be very dangerous, so wear eye protection and exercise due caution, or take it to a professional if you’re not sure how to proceed.

We recommend that you clean your microwave before proceeding, as any nasty gunk on the bottom may end up stuck to the iOpener.
  • We recommend that you clean your microwave before proceeding, as any nasty gunk on the bottom may end up stuck to the iOpener.

  • Place the iOpener in the center of the microwave.

    • For carousel microwaves: Make sure the plate spins freely. If your iOpener gets stuck, it may overheat and burn.

which temperature must be used for heating? Thx

fbarletta - Reply

I found you need to be very patient when using the iOpener. It's worth taking your time, giving the heat time to work on the glue. When I finally got the battery out, there were some strips of glue left behind that I just cleaned off with some isopropanol before installing the new battery.

By the way, I had to run the iOpener for longer in my microwave for it to get hot enough. When it was too hot to touch, I figured it was hot enough for the batteries.

Fredrik -

I didn't find this to be as hard as I had built it up in my mind to be; HOWEVER, saying that I need to say years ago I was the local Nokia service center in my town. But many years ago right after they got rid of analog times. Yeah. A classic installer/repairer mistake when starting something they haven't fixed or installed before is picking up the instructions, flipping through them; maybe even reading a section that is new-then tossing the instructions over the shoulder. "I got this." This usually comes right before something major gets broke. And I can tell you when you try to do it yourself and then mess it up horribly then take it to the repair shop. Well we called that "I can do it myself" syndrome and charged extra to put back together what they brought in in the box. Now knowing all this - I can't stress this enough because I am stupid, stupid, stupid. COVER YOUR SCREEN IN CLEAR BOXING TAPE AND READ ALL THE INSTRUCTION BELOW THROUGH TO THE END BEFORE EVEN ATTEMPTING THIS FIX. Take my advise.

windizy - Reply

I didn't have an iOpener, so I used a wheat type heat bag. If you do this though, make sure you put a layer of plastic between your Mac and the bag, or you'll get condensation in places you don't want it.

Martin Gray - Reply

I started out using the iOpener but switched to my wife's hairdryer. A heat gun or hair dryer proved to be much more convenient and is a time saviour. You can heat more and the glue becomes more fluid make the next steps with the opening picks much easier

Jan Van Puymbroeck - Reply

Use a hair dryer! Watch this vid: It is much easier to do if you heat it from the other side.

Fletcher Carpenter - Reply

I wonder how many people actually wrapped in their iPhone into iOpener and put this "sandwich" into microwave??

putinaspiliponis - Reply

I know this is obvious, but backup your iPad with iTunes before you start. I'd also turn off your passcode if you have one.

Laurie Higgins - Reply

Ther first time you heat up the iOpener for this repair when its room temperature I had to heat it up for more than 30 seconds. I remember I had to heat it up for around 45 seconds. However, after that when you need to reheat it again during the repair 30 seconds will be enough.

Yousef Ghalib - Reply

I've been with Samsung for 8 years now!! Never did i have a case on any of my phones My Samsung 8 is 2 months old the case protector around the edge pop off and broke my phone it's like someone put a bullet hole in it

Sherry Carew - Reply

Not everybody has a microwave. You need to state how long and at what temperature in a conventional oven.

Esmond Pitt - Reply

Hi, the microware have multiple power 1 to 9, what must be used ?



Cedric VINCENT - Reply

Heat the iOpener for thirty seconds.
  • Heat the iOpener for thirty seconds.

  • Throughout the repair procedure, as the iOpener cools, reheat it in the microwave for an additional thirty seconds at a time.

  • Be careful not to overheat the iOpener during the repair. Overheating may cause the iOpener to burst.

  • Never touch the iOpener if it appears swollen.

  • If the iOpener is still too hot in the middle to touch, continue using it while waiting for it to cool down some more before reheating. A properly heated iOpener should stay warm for up to 10 minutes.

May I know the temperate limit about heating iOpener? (maximum 150 degrees Celsius?) thx so much.

yamayhuang - Reply

I had to heat mine up for more than 30 seconds. After 30 seconds on high it was only warm. It had to keep trying different times and checking it until it got hot. I think the initial time that I put it in for was over a minute.

whale13 - Reply

DO NOT USE IN NON ROTATING MICROWAVE! It will pop a hole. I had it in for 45 seconds the first time. It wasn't very hot inside and I saw it started to leak on the paper towel I put under it. Just a fair bit of advice. I think I will just stick with the heat gun. Loud but useful.

Alex Jackson - Reply

I don't own a microwave.

mdanihy - Reply

Its again waterproof when you change iphone 7 battery?

Jon - Reply

I don't have a microwave???

Joe Blow - Reply

30 sec at which equivalent watts setting and what temperature does iOpener heats up to for 30 secs. Only just bought it so needs info before using it. Thanks

Sam Stieg - Reply

can i use just ordinary microwave???

juneseok kwon - Reply

If I don't have a microwave then I try to use hot air gun so how many munuts i want to heat ?

Mohideen Rifay - Reply

I heated mine up for 30 seconds, tested, then again for 30 seconds. It felt adequately hot. Leaving it on the left side, per the instruction, for a minute did not loosen the adhesive. I ended up pulling the suction cup hard enough to shadder the old screen. Moral of the story, I don't think it gets hot enough safely to have an affect.

Travis Dixon - Reply

There is a clear problem here with the heating part using the iopener details are given. Whoever is testing them needs to make it clear - What temperature does it need to be? And for which phone models, because they differ in what's needed. It's only £10-15 for a laser guided temp sensor unit, and the designers/repairers should have one of those already for doing these kinds of repairs. Explaining half a repair, is worse than not explaining at all :-(

assortedrubbish - Reply

I used a hot water bottle, works well as it covers the whole screen and stays hot for longer.

dave - Reply

If I may suggest include your microwave wattage so people can get an idea on time for there own

Patrick Storey - Reply

I ended up using a hair dryer. That iOpener thing took forever.

mark fitzgerald - Reply

30 seconds sure isn’t cutting it… 45 didn’t get the screen of my iPad air 2 to budge either… even after resting on the ipad for 4 minutes.

60 seconds in the microwave, the iOpener burst.

I’ll get a new one and try once more with heating it 45 seconds and repeat that for 30 minutes like others have said here. If that doesn’t work it’ll have to be the heat gun.


Karl Marble - Reply

  • Remove the iOpener from the microwave, holding it by one of the two flat ends to avoid the hot center.

  • The iOpener will be very hot, so be careful when handling it. Use an oven mitt if necessary.

Will a hair dryer work for heating the glass?

Me berg - Reply

Yes, as does a heat gun.

anonymous 4602 - Reply

I did this repair. I used a hair dryer, I think it works better: gets very hot fast.

Cobus de Beer - Reply

  • Opening your phone will compromise its waterproof seals. Have replacement adhesive ready before you proceed, or take care to avoid liquid exposure if you reassemble your phone without replacing the adhesive.

  • Apply a heated iOpener to a long edge of the S8 for about 2 minutes.

    • You may need to reheat and reapply the iOpener several times to get the phone warm enough. Follow the iOpener instructions to avoid overheating.

  • A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the phone—the OLED display and internal battery are both susceptible to heat damage.

  • As you're waiting for the adhesive to soften, move on and read the following step to get an idea of where to pry.

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  • In the following steps you will be cutting through the adhesive around the edge of the rear glass panel.

  • The adhesive on the rear case is laid out as seen in the first image.

  • The prying pattern as seen from the outside of the phone is as follows:

    • Thick portions of adhesive

    • Thin areas of adhesive

    • Avoid prying here, to protect the fingerprint sensor.

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  • Once the back panel is warm to the touch, apply a suction cup as close to the heated edge of the phone as you can while avoiding the curved edge.

    • The suction cup will not make a good seal on the curved portion of the glass.

    • If the phone's back cover is cracked, the suction cup may not stick. Try lifting it with strong tape, or superglue the suction cup in place and allow it to cure so you can proceed.

  • Lift on the suction cup, and insert a halberd spudger, or opening pick, under the rear glass.

    • Due to the curved glass, you will be pushing up, rather than inserting parallel to the plane of the phone.

We can't seem to get anything between the edges even after heating the back panel. Any tips?

Megan Kennington - Reply

Hi Megan, unfortunately the adhesive is super tough on this one. I’d recommend carefully continuing to apply heat, very gradually so that you don’t accidentally overheat the battery. Eventually you should be able to get a little gap with the suction handle.

Adam O'Camb -

  • Once you have the tool firmly inserted into the glass, reheat and reapply the iOpener to soften the adhesive.

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  • Slide an opening pick or the blade of a Halberd spudger down the side of the phone, separating the adhesive.

  • Go slowly so that the tool doesn't slip out of the seam. If cutting becomes difficult, reheat and reapply the iOpener.

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  • Repeat the previous heating and cutting procedure for the remaining three sides of the phone.

  • Leave an opening pick on each side as you continue to the next to prevent the adhesive from resealing.

Petite erreur: le guide dit iPhone au lieu de S7 :)

Nicolas Duthilleul - Reply

Bonjour Nicolas ! Merci pour la remarque ;-) Nous l’avons prise en compte et corrigé la traduction. La prochaine fois, n’hésitez pas à corriger directement en cliquant sur le bouton Traduire en haut à droite de l’étape.

Claire Rapp -

  • The fingerprint sensor cable connects the phone to the rear glass near the main camera. The cable is very short and should disconnect as the rear glass is removed.

  • As you lift the glass, peek in to be sure the orange cable with a blue connector has disconnected.

  • Use the opening picks to slice through any remaining adhesive and open the phone slightly.

  • If the fingerprint sensor cable seems snagged or stays taut do not open the phone any further. Disconnect the connector with the point of a spudger before proceeding.

  • During reassembly, in order to reconnect the fingerprint sensor cable, first angle the back cover into position until the cable connector lines up perfectly over its socket. Then, use the flat end of your spudger to gently snap the connector into place by pressing it straight down.

  • Remove the glass from the phone.

For reassembly, if the fingerprint scanner is removed from the back cover: it’s much easier to place the fingerprint scanner in the small compartment on the back of the phone, connect it and then finally put the replacement back cover on. The adhesive on the inside of the back cover will get connect to the fingerprint scanner and hold it tightly.

Brian Hoffmann - Reply

  • To reinstall the back cover:

    • First use tweezers to peel away any remaining adhesive from both the back cover and the phone's chassis.

    • Then, clean the adhesion areas with high concentration isopropyl alcohol (at least 90%) and a lint-free cloth. Swipe in one direction only, not back and forth. This will help prep the surface for the new adhesive.

    • Be sure to turn on your phone and test your repair before installing new adhesive and resealing the phone.

    • Replacement adhesive comes in a pre-cut sheet to match the exact contours of the back cover. If that's not available, you can use a high-bond double-sided tape, such as Tesa 61395. Be aware that this leaves gaps that are vulnerable to liquid intrusion.

    • After installing the rear cover, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond, such as by placing it under a stack of heavy books.

  • If desired, you may reinstall the back cover without replacing the adhesive. Remove any large chunks of adhesive that might prevent the back cover from sitting down flush. After installation, heat the back cover and apply pressure to secure it. It won't be waterproof, but the glue is usually more than strong enough to hold.


Vous parlez d’ajouter de l’adhésif, comment et où le trouve-t-on cet adhésif ?

Difficile à appliquer ?



Steph D - Reply

Mille excuses, je viens de voir les “adhesive strips” :)

Steph D - Reply

  • Remove eleven 3.7 mm screws.

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  • Remove the NFC antenna and charging coil assembly.

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  • Remove three 3.7 mm Phillips #000 screws.

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  • Remove the loudspeaker assembly.

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  • Use the flat end of a spudger to disconnect the battery connector.

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  • Prepare an iOpener and apply it directly to the battery for at least two minutes. Reheat and reapply the iOpener as needed.

  • Alternatively, apply some isopropyl alcohol under each corner of the battery and allow it to penetrate for several minutes to help weaken the adhesive.

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  • Use an opening pick to pry up the battery from the bottom.

    • You will be prying against the case directly above the daughterboard and antenna cables. Pry carefully to avoid damaging either of these components.

  • You may need to reheat and reapply the iOpener repeatedly to further soften the adhesive. The adhesive is tough and it may take a few tries to get the pick started under the battery.

  • Try your best not to deform the battery during this process. Soft-shell lithium-ion batteries can leak dangerous chemicals, catch fire, or even explode if damaged. Do not use excessive force or pry at the battery with metal tools.

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  • Slide the opening pick up the side of the battery to break apart remaining adhesive.

  • Lift the battery out of the case.

  • Do not reuse the battery after it has been removed, as doing so is a potential safety hazard. Replace it with a new battery.

  • To install a new battery:

    • Remove any remaining adhesive from the phone, and clean the glued areas with isopropyl alcohol and a lint-free cloth.

    • Secure the new battery with pre-cut adhesive or double-sided adhesive tape. In order to position it correctly, apply the new adhesive into the phone, not directly onto the battery. The adhesive should go around the perimeter of the battery compartment, but not in the rectangular cutout in the center (which is actually the back side of the display).

    • Press the battery firmly into place for 5-10 seconds.

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After reapplying adhesive, follow these instructions in reverse order to reassemble your device.

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Adam O'Camb

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Who are these geniuses that engineer a cell phone that requires complicated surgery in order to replace a faulty or dead battery? Really? And this POS costs the yuppified zombies how much?

Joseph Kennedy - Reply

What type of adhesive do you use to stick the phone back

Good Survey - Reply

Hi! In our store you’ll find a rear cover adhesive strip for the S8. In the event that that’s sold out, we recommend using Tesa Tape—the 2 mm width should work well for this repair.

Adam O'Camb -

How complicated compared to my old S4 … what a joke

mofla39 - Reply

Will the phone still be water resistant after this ?


aperret - Reply

This was wild. I hope I don’t have to use this knowledge for awhile. Why doesn’t Samsung just tell you to send it back and they will fix it for the price of a new battery? If I pay $800-$1,000 for a phone that I can’t change the battery on after a year or two, I’m going to be !#^&@@ at Samsung. Should we all complain to them about making this service available or having them advertise the lack of battery changing before a customer buys it?

mtrman94 - Reply

that’s the issue. Like Apple, Samsung want you to buy another new phone every year instead of replace the battery.


Same issue, i sent my S8 back to Samsung 15days ago and still waiting for my f****** phone.

Pietro Ferracini - Reply

This process did NOT work for me. I purchased the kit and spare battery thinking it would be as easy as the video shows. However, after multiple attempts and several different hot pads later, the cover did not budge AT ALL. Now, I’m stuck with a kit that didn’t work and a battery (not even a Samsung replacement battery like the site stated), and nothing to show for it. Not being able to replace any battery in any electrical device on your own is just a poor engineering letdown, especially in such an expensive phone.

Michael Pakosta - Reply

There are versions of phones with waterproof battery compartments and certainly they could maintain their ability to control waterproofing the product of they still redesigned the access to the back cover via a more robust removable rear cover with gasket.

But with rear main cover more secure with screws possibly?

I'm not going to spell out how to tell them to make their phones, but maybe they might consider how users want to have the ability to change the battery themselves, and maintain the control of the device without sending it to a repair site for some time period.

Think of all the professional customers, besides all the soccer moms, students and retirees who they might dismiss right away.

Military & Government Officials, maybe even Senior Company Executives and tech companies that use these for everything from email and texting to secure encrypted NSA stuff.

Make it so they can be field repaired with a fresh battery seems like a no brainer?

That's my 2 cents!

Michael McGarghan - Reply

if battery deteriorates to a very low level, say, just last 1 hour after recharge, and it’s under warranty, can we send it back to Samsung for free repair?

chasun - Reply

Just remember, if you replace someone else battery and the phone explodes, you are liable. It’s advisable, if you’re not a bonded repair person, it’s not recommended that you change this battery. If you are doing it for yourself then take all precautions and insure the battery the correct replacement and you follow all removal and install direction specifically. If you don’t the results could void your Warranty or worse explode and injure you.

lcpierce2011 - Reply

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