If you are facing issues with your S21 Battery, and keen to replace it at home, this guide will be for you to learn Samsung Galaxy S21 battery replacement with easy step-by-step guide. It is like making your phone new again; it is not hard! So, let's learn how to replace your S21 faulty battery with a new working battery!
“Disclaimer: If you do not know how to do Samsung battery replacement, ask a professional for help.”
Samsung Galaxy S21: Step-By-Step Battery Replacement Guide
Step 1: Turning Off the Samsung Galaxy S21
Check your Samsung Galaxy S21 battery life using our guide to fix it. After you fix it, you can check if it worked. Push and keep holding the volume down and side buttons together for a little bit. Press the power off button and enter your code to turn off your device.
Step 2: Heat the Back Cover
The back cover's edge is stuck together really well. You have to heat it first. Use a tool that blows hot air, like a heat gun or a hair dryer. Do not touch hot things. Heat the back cover until it is warm, but you can still touch it. Make the back cover hot by blowing hot air on it evenly.
Step 3: Pulling Up the Back Cover
You need a flat, steady tool to make a small space between the screen and the back cover. Put a suction cup on the bottom of the back cover and lift it. Put the opener in between the display and the back cover simultaneously.
Step 4: Separating the Back Cover
Use a plastic tool instead of a sharp opener to avoid hurting the case's edge. Do not push your tool deep inside, or you might break the camera. Use the hard plastic opener pick now. It cannot go in too far because of its shape. Move the tool around the back cover to soften it bit by bit. Put flat opener picks below the back cover often, so the glue does not stick again.
Step 5: Take Off the Back Cover
When you take off the back cover, make sure to take out all the plastic picks. Open it up and set it down.
Step 6: Loosen the Charging Coil Cover
Use screw storage to have a track of screws while fixing things and avoid losing them. You can use a sewing box. Our super strong magnet pad keeps everything in place. Unscrew the five screws on the cover of the charging coil. Now, stick them on the device's magnet board.
Step 7: Separating the Battery Connector
Disconnect the battery immediately to prevent a short circuit. When you apart connectors, begin from the side without tiny parts on the motherboard.
Step 8: Remove the NFC Antenna Cover
Use a plastic tool to gently lift the orange-colored battery connector from under the motherboard. We use a plastic tool called a spudger for this.
Step 9: Separate the Charging Coil
Carefully use a spudger to remove the black connector from the circuit board.
Step 10: Pull Off the Charging Coil
The bottom part of the charging coil is slightly stuck. After you disconnect the connectors, you can gently remove the charging coil.
Step 11: Unscrewing the Speaker
Take out the six screws from the speaker. Put them on the device's magnet pad.
Step 12: Removing the Phone Speaker
A little arrow at the top left tells you where to put your tool. Take out the speaker carefully and keep it aside.
Step 13: Pull Out the Connecting Cables
Take apart the cables that connect the USB and motherboard. Take out the cables from your device.
Step 14: Separate the Screen Cable
The Galaxy S21 has a new slot for the screen cable that makes it easy to remove. Use a spudger tool to remove the screen cable from the USB and motherboard gently.
Step 15: Take Out the Screen Cable
Take out the cable that's not connected to the thing.
Step 16: Heat the Battery Adhesive
The battery in the S21 is stuck hard to the screen. Heat it before removing it to make it easier. Do not heat the battery directly; only heat it from the screen side. Use a hot air gun to warm up the battery while aiming it at the opposite spot on the display. You can fix anything if you have the right tools! Our store has many good professional tools.
Step 17: Lifting the Battery
When the sticky stuff is warm enough, use a plastic tool or suction cup to lift the battery easily. Put the suction cup on the bottom of the battery and lift it to take it out. Use a plastic tool to push the battery up from the bottom. You can use the battery spudger tool for that.
Step 18: Separating the Battery
You can loosen the battery easily by moving the plastic underneath it with a knife-like motion. Put a flat pick where you have loosened the adhesive to stop it from sticking again. Put the flat elastic under the lifted edge and move it slowly under the battery until it comes off the screen.
Step 19: Removing the Battery
You might need to bend the battery connector to ensure it fits well. Put it correctly by matching the slot on the device's motherboard. Gently bend the battery connector before putting it in. Take off the covers on the battery's back and front.
Step 20: Putting in the New Battery
Put the new battery on the screen and push it down hard.
Step 21: Joining the Screen Cable
Look at the tag on the screen cable to help you put it in the right place. Do not push connectors too hard. Breaking something can make the whole thing stop working. Make sure the display cable is straight, and then push the two connectors onto the device's motherboard and the slot that's not attached. You have to listen and feel them snap together.
Step 22: Linking the Connecting Cables
Look at the label on the screen cable to help you line it up. Put the two cables back in the device. Connect the two connectors to the device's motherboard and USB board.
Step 23: Installing the Speaker
The speaker part has three little bumps. To ensure the module fits right, you need to hook it to the screen frame when putting it in. Put the thing that makes sound back where it was before.
Step 24: Screwing the Speaker in Place
When you combine things with screws, use the right screws for each part. Uh oh, if you use a screw that's too long or in the wrong spot, it could hurt the screen. Put the speaker module into position and use six Phillips screws to hold it there.
Step 25: Setting up the Charging Coil
Move the NFC antennas in the screen and push it slightly to stick it back together.
Step 26: Linking the Charging Coil
Open the metal cover and connect the black plug underneath to charge.
Step 27: Connecting the Battery Connector
Put the battery connector on last, so you do not accidentally make a spark. Now, you can put the orange-coloured battery connector back on the motherboard.
Step 28: Fixing the Cover Plate
Put the cover back on after connecting the battery and charger.
Step 29: Test Your Samsung Galaxy S21
If something does not work, check if everything has been set up and attached correctly. Plug in your Galaxy to see if the new battery works. If you can, put it on a portable charger to see if it charges wirelessly. To test more stuff, use *#0*# in the mobile application to open the Samsung test menu. Use it to seek Samsung Galaxy S21 size.
Step 30: Putting a New Adhesive Frame
You do not have to wear the new sticky frame if you do not want to. If it is still good, you do not have to put in a new one. We suggest getting a new sticky frame if it is broken or does not stick well anymore.
Step 31: Attach the Phone's Back Cover
Heat the back cover's edge to improve the glue stick. You can put books on your device or hold them tightly for a little while to make them heavier. Put the back cover on your Samsung Galaxy S21 after it is fixed by pressing it onto the display.
We just learned to how to replace Samsung S21 battery step by step with pics. Remember, slow and steady wins the race. Keep learning, trying, and ask an expert if you need any further help. Keep your eyes peeled for more cool tech stuff that we time too time-share to learn more about S22 fixes and other smartphone models repair work.