How to replace Samsung Galaxy S9 battery

Depending on how you take good care of your Samsung Galaxy S9, the first component to deteriorate after a year or two is the battery. You would know if its defective when your phone no longer charges with either wired or wireless charger or charges intermittently. If you also noticed that your device no longer last as long as before, then that’s a sign that the battery has deteriorated.

The Samsung Galaxy S9 doesn’t have a removable battery so you really have to open up the device to remove it. The challenge is not with battery replacement but how to remove the back cover without damaging any components inside and dealing with very strong adhesives that keep the phone in one piece. In fact, you’ll be spending more time removing and replacing it than replacing the motherboard on any other components inside.

Before we move on, if you happen to find this post while looking for a solution to a different problem, then visit our Galaxy S9 Help Guides for we have already addressed some of the most common issues with this phone. We may have already published articles that could help you fix the problem with your device.

Things you need

  • Heat gun or hair dryer
  • Suction cup
  • Small Phillips screwdriver
  • Adhesive remover (optional)
  • Prying tools
  • OEM Battery for Samsung Galaxy S9
  • OEM Back Cover Sticker for Samsung Galaxy S9 (optional)

How to remove the back cover

  1. Remove the SIM/SD card tray and pull the stylus out.
  2. Using the heat gun, heat up the edges of the back cover until it would be uncomfortable to touch it. Just apply enough heat to loosen the adhesive and remember that applying too much heat may damage the battery. And when applying heat, do not point the gun in one place, always move around the edges.
  3. Now place the suction cup at the bottom part of the back cover.
  4. Gently lift the suction cup until you can see a slight opening between the back cover and the frame. After applying reasonable amount of upwards pressure, the back cover should separate slightly from the frame but if it doesn’t, you may need to apply more heat.
  5. Place a prying tool into the crack to prevent the glue from sticking back to the frame.
  6. Once the prying tool is inserted, you may now remove the suction cup.
  7. Move the prying tool along the sides to loosen the adhesive but be very gentle in doing this so as not to mess up some components. Also, don’t push the prying tool too deep. You may use more prying tools if necessary. If the phone cools down before the back cover is removed, try applying heat again to loosen up the adhesives.
  8. Once the back cover is loose enough, lift it gently so as not to break the flex cable of the fingerprint scanner. Remove the flex cable to set the back cover free.

How to remove and replace the battery

Now that the back cover is removed, you now have access to the components inside your phone.

  1. Remove the 15 screws that secure the NFC, wireless charging coil and the loudspeaker module.
  2. Remove the NFC and wireless charging module and the loudspeaker module.
  3. Disconnect the flex cable of the battery from the motherboard.
  4. If you have an adhesive remover, give each side of the battery to loosen the adhesive beneath it. If you don’t, then hit the side of the phone with a heat gun to loosen the adhesive. Remember that it’s a strong adhesive that holds the battery in place.
  5. Use a prying tool to detach  the battery from its compartment. Use a prying tool with enough leverage but be careful not to puncture the battery. Better use a plastic prying tool to remove the battery.
  6. Once you’ve successfully detached the defective battery, replace it with a new one and make sure to set it properly into the compartment. The old adhesive may still work if you used heat to remove the battery rather than the adhesive remover.
  7. Now, connect the battery to the motherboard.
  8. Put the NFC and wireless charging module in place as well as the loudspeaker and secure them with the screws you removed a while ago.
  9. Reconnect the flex cable of the fingerprint sensor to the motherboard.
  10. If you have the OEM Back Cover Sticker for Samsung Galaxy S9, then remove the old adhesive from the back cover and use the new one instead. If you don’t, then just use the old one. It will hold the back cover in place but you have to apply enough heat to loosen it before putting it back in place.

After all these steps, it’s time to turn your phone back on. I hope everything works well. Thanks for reading!