Galaxy S8+ battery replacement guide

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

  • Galaxy S8+
  • 13 Steps
  • Difficult
  • 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
  • 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

    Wenn der Samsung Galaxy S8 Plus Akku nur noch kurze Zeit durchhält, ersetze ihn durch einen neuen. Das Erstatzteil wird zusammen mit einem Klebestreifen zur Fixierung geliefert. Der leistungsstarke neue Akku hilft, wenn das Smartphone bei starker Belastung abstürzt, da die Spannung temporär abfällt, wenn sich dein Galaxy S8 Plus bei Kälte ausschaltet, sich nicht mehr einschalten oder laden lässt oder wenn die Akku-Laufzeit sehr gering ist. Sobald du den neuen Akku eingebaut hast, hält dein Samsung Galaxy S8 Plus viel länger durch und du kannst wieder länger telefonieren, Musik hören, Videos gucken oder im Internet surfen. Achtung: Um optimale Leistung zu erhalten, solltest du den Akku zehn mal komplett entladen (Video abspielen und das Blitzlicht einschalten) und dann vollständig aufladen. Wie immer haben wir das Ersatzteil getestet, um sicherzustellen, dass es unserem hohen Qualitäts- und Funktionalitätsstandard gerecht wird.

    €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

Wenn der Samsung Galaxy S8 Plus Akku nur noch kurze Zeit durchhält, ersetze ihn durch einen neuen. Das Erstatzteil wird...

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.

13 steps
  1. Switching off your device

    Galaxy S8+ - Switching off your device 01
    Galaxy S8+ - Switching off your device 02
    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 Plus 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
    1. The back cover’s really glued to the chassis. Heat the device evenly with hot air to soften the glue.
    2. Then carefully try to lift the rear glass using a flat, blunt tool. It’s best if you find a loose spot where you can insert the first pick. Then work your way around the device step by step.

    Use a suction cup to lift the glass if you can’t find anywhere to insert the toolThis step can take a pretty long time. You may have to heat the rear glass or the glue a few more times before you can finally detach itDon’t take off the back cover all the way because you have to disconnect the connector for the fingerprint reader first.

  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
    Galaxy S8+ - Disconnecting the fingerprint sensor 04
    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 NFC antenna

    Galaxy S8+ - Removing the NFC antenna 01
    Galaxy S8+ - Removing the NFC antenna 02
    Galaxy S8+ - Removing the NFC antenna 03
    Galaxy S8+ - Removing the NFC antenna 04
    • 11 × 3,8 mm Phillips Schraube
    1. Remove the screws that attach the upper cover to the display.
    2. The cover is latched onto the case. Slide a flat tool under the latches to disconnect them.
    3. Now remove the antenna.
  5. Disconnecting the battery contact

    Galaxy S8+ - Disconnecting the battery contact 01
    Galaxy S8+ - Disconnecting the battery contact 02
    1. Using the spudger, carefully disconnect the battery contact from the motherboard.
  6. Removing the speaker

    Galaxy S8+ - Removing the speaker 01
    Galaxy S8+ - Removing the speaker 02
    Galaxy S8+ - Removing the speaker 03
    • 4 × 3,8 mm Phillips Schraube
    1. Remove the screws that attach the speaker to the display.
    2. Use a flat object like a pair of tweezers to detach the speaker and then remove it.
  7. Removing the battery

    Galaxy S8+ - Removing the battery 01
    Galaxy S8+ - Removing the battery 02
    Galaxy S8+ - Removing the battery 03
    Galaxy S8+ - Removing the battery 04
    Galaxy S8+ - Removing the battery 05

    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.
  8. Preparing the new battery

    Galaxy S8+ - Preparing the new battery 01
    Galaxy S8+ - Preparing the new battery 02
    1. Remove the first protective film from the battery adhesive strip.
    2. Attach the adhesive strip to the battery.
    3. Press down the adhesive strip to glue it on and remove the second film.
  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
    Galaxy S8+ - Installing the speaker 03
    • 4 × 3,8 mm Phillips Schraube
    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.
    3. Then reinsert the marked screws.
  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 NFC antenna

    Galaxy S8+ - Installing the NFC antenna 01
    Galaxy S8+ - Installing the NFC antenna 02
    Galaxy S8+ - Installing the NFC antenna 03
    • 11 × 3,8 mm Phillips Schraube
    1. Put the cover with the antenna back in the enclosure after hooking it onto the top of the enclosure.
    2. Then press the cover with your fingers until it clicks gently into place all over.
    3. Fasten the phillips screws.
  13. 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
    Galaxy S8+ - Attaching the back cover 04
    Galaxy S8+ - Attaching the back cover 05
    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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