Samsung Galaxy A21s Battery Replacement
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Guide for replacing the battery in the Samsung Galaxy A21s.
Opening the device will compromise its waterproof seal. If you do not replace it, the phone will still function, but it will no longer be waterproof.
Before you begin disassembly, discharge the battery in the device to below 25%. If your battery is swollen, proceed with extreme caution and do not heat the device. If you are not sure how to proceed, take the device to a professional.
During reassembly, you will need adhesive to secure the battery and the back cover.
Perform the repair in a clean and well-lit area.
After completing the repair, calibrate your new battery to achieve optimal performance. Charge it to 100% and continue charging it for at least another 2 hours. Then use the phone until it turns off due to a depleted battery, and subsequently charge it uninterrupted to 100%.
Step 1 Removing the SIM card tray
- Use a SIM eject tool to remove the SIM card tray.
When reinserting the SIM card tray, make sure it is correctly oriented.
Step 2 Opening 1
Heating the bottom edge of the smartphone helps soften the adhesive securing the display and makes it easier to open.
- Use a hair dryer or heat gun to heat the bottom edge of the smartphone for approximately 3 minutes until the temperature reaches approximately 80°C.
- Do not put the smartphone in a microwave !!!
Step 3 Opening 2
- Place the suction cup on the back cover so that you can gently separate the back cover from the smartphone frame.
- Then insert the Fixservis card between the frame and the back cover to create a small gap, and slowly slide it along to detach the back cover.
- If necessary, use cleaning fluid (Cleanser - Isopropanol 100%).
If you have trouble separating the back cover, heat the smartphone again to further soften the adhesive. Be careful to avoid overheating the device.
Step 4 Removing the back cover
- Remove the back cover.
Step 5 Disassembling the midframe
- Using a Pentalobe screwdriver, unscrew the sixteen 3 mm Phillips screws securing the midframe.
Throughout the entire repair, keep track of each screw and make sure that it is returned exactly to the location it came from to avoid damaging your smartphone.
Step 6 Removing the midframe
- Insert the Fixservis card between the midframe assembly and the front panel, and slowly slide it around the smartphone to separate the midframe.
- Then remove it.
Step 7 Removing the old adhesive around the edges of the midframe + back cover
- Remove the old adhesive around the edges of the midframe.
- If necessary, use Cleanser IPA Plus cleaning spray to remove any remaining old adhesive.
Step 8 Disconnecting the battery
- Use the flat end of a Spudger to disconnect the battery connector.
Step 9 Disconnecting the interconnect cable from the motherboard
- Use the flat end of a Spudger to pry up and disconnect the interconnect cable from the motherboard at both the top and bottom.
- Then remove it using tweezers.
Step 10 Disconnecting the antenna cable
- The mobile phone antenna cable is attached to the motherboard.
- Use a Spudger to disconnect the antenna from the motherboard at both the top and bottom, then remove it using tweezers.
Step 11 Removing the battery
- Use a large Spudger or a Fixservis card to remove the battery from the device.
- If you are unable to remove the battery, use a hair dryer or heat gun on the display for 1-2 minutes to soften the adhesive underneath the battery.
- Be careful not to overheat the smartphone.
Step 12 Installing the new battery
- Then insert the new battery and secure it back into the smartphone using double-sided adhesive tape.
During reassembly, follow this guide in reverse order.
Step 13 Applying new adhesive to the smartphone back cover
- Apply the new adhesive around the edges of the back cover from the inside.
- Then attach the back cover to the smartphone.
The new adhesive ensures the smartphone's resistance to water and dust.
Step 14 Installing the back cover
- Use a Spudger to connect the fingerprint sensor flex cable to the smartphone assembly before installing the back cover.
- Place the back cover onto the smartphone assembly.
Step 15 Attaching the clamps
- Attach the clamps as shown in the image to ensure better bonding of the adhesive between the cover and the display.
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