Galaxy A51 - Replacing the battery

  • Galaxy A51
  • 14 Steps
  • Easy
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Your Samsung Galaxy A51 discharges much too fast? It won't charge at all?

Then it is time to replace the battery of your Galaxy A51. In this detailed photo tutorial, we'll explain step by step how to do this.

Since the back cover of the A51 is made of plastic, it can be removed relatively easily compared to smartphones with a glass back cover. So even if you're not very experienced in repairing smartphones, it's easy to replace the battery.

Good luck and above all have fun with your repair! In our online store you will find the right tool kit for your Samsung Galaxy A51.


Required tools

  • Tool for prying out batteries

    Tool for prying out batteries

    You have to use a very stable tool to pry out the battery. At the same time, it has to be flat enough to insert below the battery.

    €2.00 at the iDoc store
  • Flat Picks

    Flat Picks

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

    €2.00 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 €14.47 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
  • iFlex opening tool

    iFlex opening tool

    Opening your smartphone can be a very delicate operation, especially if the glue is very persistent. The blade of the flexible but sturdy iFlex measures just 0.15 mm, so it fits in even the smallest gaps, such as between the screen and the frame. The practical iFlex is made of stainless steel and sits comfortably in the hand. This makes it the perfect assistant for every smartphone repair.

    €10.00 at the iDoc store
  • iPlastix

    iPlastix

    Do you want to open your smartphone or lever out large parts like the battery? Then the iPlastix with its large blade will help you. The practical assistant is made of flexible, especially sturdy plastic and lies comfortably in the hand. Thanks to its design, you can even get into smaller gaps, for example to lift the screen or to prevent it from sticking together again.

    €10.00 at the iDoc store
  • SIM Tool

    SIM Tool

    If you want to use a different SIM card or repair most parts of your Apple devices, you’ll have to remove the SIM card first. The SIM card tray only comes out if you insert a tool with a very fine point into the small hole next to the SIM card slot. This tool is designed especially for ejecting the SIM card from all iPhones and iPads, and fits perfectly into the appropriate opening.

    €2.00 at the iDoc store
  • Plastic prying tool

    Plastic prying tool

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

    €2.00 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.

    €13.00 at the iDoc store

Required replacement part

Show all replacement parts for the Galaxy A51 

Replacement parts and tools for this repair

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

Getting started with the repair of your Galaxy A51

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

14 steps
  1. Switching off your Samsung Galaxy A51

    Galaxy A51 - Switching off your Samsung Galaxy A51 01
    Galaxy A51 - Switching off your Samsung Galaxy A51 02
    Galaxy A51 - Switching off your Samsung Galaxy A51 03

    We recommend that you use our checklist to test the basic functions of your phone before repair. This way you can rule out the possibility that anything has been damaged during the repair. Afterwards you have to switch off your A51 to avoid a potential short circuit.

    1. To do this, first press and hold the side and volume down key simultaneously for a few seconds.
    2. Tap on "Switch off" in the displayed menu.
    3. Your phone will now shut down completely within a few seconds.
  2. Heating up the back cover

    Galaxy A51 - Heating up the back cover 01
    Galaxy A51 - Heating up the back cover 02
    Used tools

    The Galaxy A51 is opened via the firmly adhered plastic back cover. To remove it, you first have to heat the adhesive film with hot air. Use a hot air device such as a heat gun or a regular hair dryer.

    1. First, place your phone face down on a soft, clean surface.
    2. Move the hot air device evenly over the edge of the back cover.

    A rule of thumb: The edge of the back cover should only be heated up to a point where you can still touch it without getting your fingers burned.The top and bottom edges of the back cover are glued especially tightly together.


    Used tools
  3. Lifting up the back cover

    Galaxy A51 - Lifting up the back cover 01
    Galaxy A51 - Lifting up the back cover 02
    Galaxy A51 - Lifting up the back cover 03
    Galaxy A51 - Lifting up the back cover 04
    Used tools

    Once the edge of the back cover has warmed up sufficiently, you can start to carefully remove it from the middle frame.

    Opening the Galaxy A51 will void the manufacturer's warranty.

    1. Place a suction cup in the lower part of the back cover and pull it slowly upwards to create a narrow gap between back cover and middle frame.
    2. At the same time try to insert a flat, stable tool into the gap and enlarge it. We recommend the iFlex and flat plastic picks for this.

    The iFlex is made of very thin, stable metal and has sharp edges.To avoid scratching the frame of your device, we recommend that you start with the iFlex at this stage and continue as early as possible with a flat plastic pick.The easiest way to insert the tool is to place it in one of the two corners of the lower frame of your device.

    Used tools
  4. Detaching the back cover

    Galaxy A51 - Detaching the back cover 01
    Galaxy A51 - Detaching the back cover 02
    Galaxy A51 - Detaching the back cover 03
    Galaxy A51 - Detaching the back cover 04
    Used tools

    Be careful not to insert your tool too far into the device to avoid damaging components.

    1. Once a gap is created, remove the back cover from the middle frame piece by piece by moving the tool along the edge of the back cover.
    2. Press it upwards at the same time to release it from the middle frame.

    At regular intervals, place flat picks at the loosened points of the back cover frame so that the adhesive cannot rebond. For this, turn the picks from the pointed side to their broad side.

    Warm up the glue with hot air at regular intervals to make it easier to loosen.
    1. One the back cover is entirely detached, put it aside.
    Used tools
  5. Removing the SIM tray

    • 13 × 3.5 mm Phillips

    The middle frame is not glued, but firmly hooked into the display unit with plastic lugs.

    1. First loosen all screws that fix the middle frame to the display with a Phillips screwdriver.

    For the storage of loosened screws and small components it is advisable to use a screw storage box. We recommend our magnetic pad for this purpose. On this pad, the removed components can be arranged in the same way as they were installed in the telephone.

    1. In the next step, remove the SIM tray from the middle frame by pressing with a SIM tool, or another pointed object into the small round opening next to it.


  6. Disconnecting the battery

    Galaxy A51 - Disconnecting the battery 01
    Galaxy A51 - Disconnecting the battery 02
    Galaxy A51 - Disconnecting the battery 03
    Used tools
    • Connector

    To prevent a short circuit during the repair, you must disconnect the battery from the mainboard as soon as possible.

    When detaching the battery connector make sure that you start from the side where there are no small components on the board. This will prevent possible damage.

    1. Use a sturdy plastic lever tool to slide under the battery connector and carefully lift it off. We recommend a handy plastic spudger for this purpose.
    Used tools
  7. Detaching the flex cabel

    Galaxy A51 - Detaching the flex cabel 01
    Galaxy A51 - Detaching the flex cabel 02
    Galaxy A51 - Detaching the flex cabel 03
    Galaxy A51 - Detaching the flex cabel 04
    Used tools
    • Connector

    Above the battery runs a flex cable that connects the mainboard and the USB board.

    When detaching the flex cable connectors make sure that you start from the side where there are no small components on the board. This way you avoid possible damage.

    1. Use the plastic spudger to move under the flex cable connectors one after the other, and carefully lift them off.
    2. Then put the detached flex cable aside.
    Used tools
  8. The right tools for your repair

    With the right tools, you will succeed in any repair. In our store you will find a large selection of professional quality tools.
    VIEW NOW
  9. Removing the battery

    Galaxy A51 - Removing the battery 01
    Galaxy A51 - Removing the battery 02
    Galaxy A51 - Removing the battery 03
    Used tools

    The battery is glued in the display unit over a wide area. In order to remove it, you must first heat the glue with hot air.

    Never heat the heat-sensitive battery directly, but always from the side of the display only .When removing the battery, take care not to bend it or damage it otherwise.

    1. Turn your phone upside down with the display facing up and move hot air evenly over the area where the battery is located.
    2. Turn the display unit over again and use a sturdy plastic tool to slide it under one edge of the battery to gently lift it up. We use the battery spudger for this.
    3. If the battery is slightly loosened, you can use a flat, flexible tool such as the iPlastix to slide it under the battery to completely detach it from the display unit.
    Used tools
  10. Inserting the battery

    Galaxy A51 - Inserting the battery 01
    Galaxy A51 - Inserting the battery 02
    Galaxy A51 - Inserting the battery 03
    Galaxy A51 - Inserting the battery 04

    The replacement battery for the Galaxy A51 is already supplied with adhesive strips on the back. With these strips the battery can be securely attached to the display unit.

    1. To make sure that the new battery sits flush in the unit, first remove all adhesive residues from the inside of the display.
    2. Then remove all protective films from the adhesive surfaces of the replacement battery.
    3. Insert the new battery into its guide in the display unit and press it firmly so that the adhesive bonds evenly everywhere.
  11. Connecting the flex cable

    Galaxy A51 - Connecting the flex cable 01
    Galaxy A51 - Connecting the flex cable 02
    Galaxy A51 - Connecting the flex cable 03
    • Connector

    After inserting the battery, the flex cable can be connected.

    1. Align the flex cable.

    The labels Main and Sub on the cable help you to align it correctly.

    1. Attach one connector each on the mainboard and the USB board.
  12. Connecting the battery

    Galaxy A51 - Connecting the battery 01
    Galaxy A51 - Connecting the battery 02
    • Connector

    Once the battery is inserted and the flex cable connected, the battery can be connected.

    1. Attach the battery connector by gently pressing it down.
  13. Installing the middle frame

    • 12 × 3.5 mm Phillips

    Once the battery is connected, the middle frame can be installed.

    Take care to align the middle frame correctly. The recess for the camera can be used for orientation.

    1. Place the middle frame on the display unit and press it firmly so that it locks into place from all sides.
    2. Then slide the SIM tray into the middle frame of your Galaxy A51.

    The printing on the SIM tray must point towards display.

    If the SIM tray does not slide in easily, the mainboard may not be seated properly.

    1. Finally fix the middle frame to the display unit with the Phillips screws.
  14. Test your Galaxy A51

    Galaxy A51 - Test your Galaxy A51 01
    Galaxy A51 - Test your Galaxy A51 02
    Galaxy A51 - Test your Galaxy A51 03

    Before you glue the back cover of your A51 again, you should test the functionality of the replacement display.

    1. Switch on your phone and enter *#0*# in the number field to access the Samsung test menu.
    2. For example, test whether the new display shows the colors correctly and whether the touch works everywhere on the display.

    You can also test other components, such as the vibration motor and speakers.

    1. If everything works as expected, you can close the device. If not, check again if everything is properly installed and connected.
  15. Installing the back cover

    Galaxy A51 - Installing the back cover 01
    Galaxy A51 - Installing the back cover 02
    Galaxy A51 - Installing the back cover 03
    Used tools

    Once the repair is complete, you still have to attach the back cover including a new adhesive frame to close your Samsung Galaxy A51.

    1. Position the back cover over the display unit and the middle frame.
    2. Press it evenly by running your fingers once along the entire edge of the back cover.
    3. Finally, heat the back cover again, and weigh it down for half an hour with some books, so that the glue can bond firmly again.
    Used tools
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