Samsung Galaxy S8 - Replacing the battery

The battery life is low. Your Galaxy S8 keeps crashing or won’t charge.

  • Galaxy S8
  • 14 Steps
  • Medium
  • 45 min.
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Introduction

In this repair guide, we show you how to replace the defective battery of your Galaxy S8 on your own. This repair can help if your smartphone crashes during heavy use because the voltage temporarily drops, you can no longer charge it or turn it on, or the battery life is very low.

Required tools

  • Flache Plektren

    Flache Plektren

    You need a very flat tool such as a flat pick to pry out parts that are glued in place.

    €1.00 at the iDoc store
  • Heat gun

    Heat gun

    You can use a heat gun to heat parts that are glued on so they’re easier to remove. In most cases, you can also use a hairdryer.

    from €14.99 on Amazon
  • For storing screws

    For storing screws

    We recommend storing your screws so you don’t mix up the various screws and small parts.

    €10.00 at the iDoc store
  • Tweezers

    Tweezers

    We recommend using tweezers to remove screws and various small parts from your device.

    €16.00 at the iDoc store
  • Plastic prying tool

    Plastic prying tool

    You need a flat plastic prying tool to disconnect the various plugs and connectors.

    €1.00 at the iDoc store
  • Suction cup

    Suction cup

    A suction cup is perfect for lifting smooth surfaces such as displays or rear glass panels.

    €2.00 at the iDoc store
  • Phillips PH00 screwdriver

    Phillips PH00 screwdriver

    You need the right screwdriver for removing PH00 screws.

    €10.00 at the iDoc store

Required replacement part

  • Samsung Galaxy S8 Akku

    Samsung Galaxy S8 Akku

    Ersetze ihn durch einen neuen Galaxy S8 Akku, der zusammen mit einem Klebestreifen zur Fixierung geliefert wird. Der leistungsstarke neue Akku hilft, wenn das Smartphone bei starker Belastung abstürzt, da die Spannung temporär abfällt, wenn sich dein Galaxy S8 bei Kälte ausschaltet, sich nicht mehr einschalten oder laden lässt oder wenn die Akku-Laufzeit sehr gering ist. Achtung: Um optimale Leistung zu erhalten, solltest du den Akku einmal komplett entladen (Video abspielen und das Blitzlicht einschalten) und dann vollständig aufladen. Sobald du den neuen Akku eingebaut hast, kannst du viel länger telefonieren, Musik hören, Videos gucken oder was auch immer du auf deinem Smartphone machen willst. Wie immer haben wir das Ersatzteil getestet, um sicherzustellen, dass es unserem hohen Qualitäts- und Funktionalitätsstandard gerecht wird. So kannst du sicher sein, dass dein Akku die volle Kapazität hat.

    €29.00 at the iDoc store
Show all replacement parts for the Galaxy S8 

Replacement parts and tools for this repair

Our tools plus the right spare part help you fix your device easily.

Samsung Galaxy S8 Akku

Ersetze ihn durch einen neuen Galaxy S8 Akku, der zusammen mit einem Klebestreifen zur Fixierung geliefert wird. Der...

Werkzeugset Samsung

Ganz gleich, welches Problem dein Handy hat - mit unserem Werkzeugset kannst du es bestimmt beheben. Dieses Reparaturset umfasst jeweils einen...

together for €78.00

Getting started

If you get stuck or have questions, you can post a comment for each step. We’d be happy to help.

14 steps
  1. Switching off your device

    Galaxy S8 - Switching off your device 01
    Galaxy S8 - Switching off your device 02
    Galaxy S8 - Switching off your device 03
    1. Turn off your device by holding down the power button until the “Power off” option appears.
    2. Use your finger to confirm that you want to shut down your Galaxy S8 and wait until the screen goes blank.
  2. Removing the back cover

    Galaxy S8 - Removing the back cover 01
    Galaxy S8 - Removing the back cover 02
    Galaxy S8 - Removing the back cover 03
    Galaxy S8 - Removing the back cover 04
    Galaxy S8 - Removing the back cover 05
    Galaxy S8 - Removing the back cover 06

    To loosen the back cover, use a heat gun or an ordinary hair dryer. Warm glue is easier to loosen, allowing you to remove the back cover. The easiest way to loosen the back cover is to use a flat and flexible tool such as the iPlastix or iFlex.

    You will also need several picks to unstick the back cover all around.

    1. Heat the spot where you start and place a suction cup on the bottom of the back cover.
    2. Press a flat tool between the back cover and the frame and pull on the suction cup.

    The iPlastix is made of plastic, so it won't scratch the device. On the other hand, it's very soft and tricky to insert.

    Be extra careful, the back cover can break very easily. If necessary, apply the heat several times and try again. Removing the back cover might take half an hour. Take a little more time and work carefully to make sure you don't break anything.

    1. Once the tool is inserted, stick a pick into the gap to keep it open. Then run the tool around the entire edge to gradually loosen the glue.
    2. Then heat the next part and insert the picks one by one.

    The back cover glue is extra strong on the lower edge.

    1. Once the back cover is loosened, lift it very slightly. The fingerprint sensor underneath the camera is still connected with a cable.
  3. Disconnecting the fingerprint sensor

    Galaxy S8 - Disconnecting the fingerprint sensor 01
    Galaxy S8 - Disconnecting the fingerprint sensor 02
    Galaxy S8 - Disconnecting the fingerprint sensor 03
    1. After detaching the back cover, carefully lift it and disconnect the fingerprint sensor using the spudger.
    2. Then you can completely remove the back cover and set it aside.
  4. Removing the screws

    Galaxy S8 - Removing the screws 01
    Galaxy S8 - Removing the screws 02
    • 14 × 3,6 mm Phillips Schraube
    1. Remove the 14 screws that attach the midframe to the display.

    If the screws get caught, use a pair of tweezers to remove them.

  5. Removing the plastic covers

    Galaxy S8 - Removing the plastic covers 01
    Galaxy S8 - Removing the plastic covers 02
    Galaxy S8 - Removing the plastic covers 03
    Galaxy S8 - Removing the plastic covers 04
    Galaxy S8 - Removing the plastic covers 05
    1. The cover with the NFC antenna is glued onto the battery. Heat the part with the NFC antenna slightly with a heat gun or hairdryer.
    2. Then carefully insert a flat tool under the antenna and remove it. The cover is hooked onto the enclosure.
    3. Remove the middle cover.
  6. Disconnecting the battery contact

    Galaxy S8 - Disconnecting the battery contact 01
    Galaxy S8 - Disconnecting the battery contact 02
    • Battery Connector
    1. Using the spudger, carefully disconnect the battery contact from the motherboard.
  7. Removing the speaker

    Galaxy S8 - Removing the speaker 01
    Galaxy S8 - Removing the speaker 02
    1. Use a flat object like a pair of tweezers to detach the speaker and then remove it.
  8. Removing the battery

    Galaxy S8 - Removing the battery 01
    Galaxy S8 - Removing the battery 02
    Galaxy S8 - Removing the battery 03

    Be very careful during this step. For this step, use a flat, blunt tool like the iSesamo to avoid damaging the battery.

    1. The battery’s really glued to the enclosure, so be very careful when you’re removing it. Carefully detach the battery from the enclosure. First insert your tool on the side between the battery and the enclosure. Slowly and carefully pry out the battery.
    2. Repeat this process on the other sides of the battery. Make sure you don’t damage the motherboard or other components.
    3. Once you’ve detached the glue, you can remove the battery from the enclosure.
  9. Inserting the battery

    Galaxy S8 - Inserting the battery 01
    Galaxy S8 - Inserting the battery 02
    1. Put the battery in the enclosure. It fits perfectly into the compartment in the middle of the enclosure.
    2. Press the battery firmly into the enclosure so the glue will stick better.
  10. Installing the speaker

    Galaxy S8 - Installing the speaker 01
    Galaxy S8 - Installing the speaker 02
    1. Now put the speaker at the lower end of the enclosure.
    2. Press it gently with your fingers until it clicks into place in the enclosure.
  11. Connecting the battery

    Galaxy S8 - Connecting the battery 01
    Galaxy S8 - Connecting the battery 02
    1. Connect the battery to the motherboard. Press the contact onto the connection on the motherboard until you hear it click into place.
  12. Installing the plastic covers

    Galaxy S8 - Installing the plastic covers 01
    Galaxy S8 - Installing the plastic covers 02
    Galaxy S8 - Installing the plastic covers 03
    Galaxy S8 - Installing the plastic covers 04
    1. First put the middle cover back on the logic board and press it firmly until it clicks into place.
    2. Then put the cover with the antenna back in the enclosure after hooking it onto the top of the enclosure.
    3. Then press the cover with your fingers until it clicks gently into place all over.
  13. Fastening the screws

    Galaxy S8 - Fastening the screws 01
    Galaxy S8 - Fastening the screws 02
    • 14 × 3,6 mm Phillips Schraube
    1. Fasten all 14 screws.
  14. Attaching the back cover

    Galaxy S8 - Attaching the back cover 01
    Galaxy S8 - Attaching the back cover 02
    Galaxy S8 - Attaching the back cover 03
    1. Put the back cover back in its original position.
    2. Connect the fingerprint sensor again.
    3. Press the back cover on all over so the glue will stick.

    You can also heat your device with hot air and then clamp it or weight it down with a couple books so the glue will stick better.

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