How to fix a Galaxy Note9 that won’t fast charge (fast charge not working)

With its huge Li-Ion 4000 mAh battery, it can take several hours to charge a Galaxy Note9. Thankfully, fast charging capability has been the mainstay for top tier Galaxy models. While fast charging issue is not that common, many Note9 users are still experiencing it. Fast charging issue can occur for a number of reasons so our troubleshooting steps below will cover as many factors as possible.

Problem: Galaxy Note9 won’t fast charge (fast charge not working)

I have note 9.. my problem is when i want to charge its appear at screen please use device charger properly its slow charging.. I always use charger head and cable original from note 8.. but it suddenly appears that word every time i plug my charger..I’ve seen you guys post and did everything on the list just trying to see if there’s any update on the situation I also notice that when I turn my phone off to charge it the yellow triangle symbol with the exclamation appears above my charging cable could that be source of the problem.

Solution: There’s a number of possible reasons why your Note9 no longer fast charge. To troubleshoot it, follow the suggestions below.


Minor bugs are sometimes fixed by doing a simple restart. Be sure to refresh the system by simulating a “battery pull” effect. Here’s how to do that:

  1. Press and hold the Power + Volume Down buttons for approximately 10 seconds or until the device power cycles. Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. You can use the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Wait for up to 90 seconds for the reset to complete.

Use another cable and adapter

Some cases wherein fast charging appears to have stopped working are attributed to a bad charging cable or adapter. Be sure to try to use another set of charging accessories to see if that will make a difference. If you can’t readily get hold of an official Note9 cable and adapter, try to borrow them from a friend or visit your local Samsung store.

Verify fast charging is enabled

While this feature is enabled by default, it’s possible you have changed some settings in your phone. So, before anything else, check the settings to know if the fast charge feature is enabled or not. Here’s how:

  1. Tap Settings.
  2. Tap Device maintenance.
  3. Tap Battery.
  4. Tap More option.
  5. Tap Advanced settings.
  6. Activate Fast cable charging option.

Charge on safe mode

Some apps may interfere with Android. To check if one of the downloaded apps is the culprit, you can boot the phone to safe mode. Here’s how:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.
  8. Check if fast charging works.

If your Galaxy Note9 charges fast, that’s a sign that one of the apps is to blame. To identify which of your apps is causing the trouble, you should boot the phone back to safe mode and follow these steps:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your S9 is still problematic, repeat steps 1-4.

Reset all settings

There may be an issue with one of your OS settings, or there may be a misconfiguration blocking fast charging to work. To minimize the chance of software bugs from developing, try to reset all settings back defaults. To do this, follow the steps below:

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap General Management > Reset settings.
  3. Tap Reset settings.
  4. If you have set up a PIN, enter it.
  5. Tap Reset settings. Once complete a confirmation window will appear.

Reset app preferences

Resetting app preferences is oftentimes overlooked in many Android troubleshooting articles but when it comes to an issue like yours, it might help a lot. It’s possible that one or some of your default apps may not be set correctly, causing this glitch to occur. Because there’s no way to know if this guess is true, what you need to do is to simply ensure that all default apps are turned on. Here’s how to do that:

  1. Open Settings app.
  2. Tap Apps.
  3. Tap on More settings at the upper right (three-dot icon).
  4. Select Reset app preferences.
  5. Restart your Note9 and check for the problem.

Factory reset

Wiping your phone is a drastic solution but it is often the only effective way to solve bugs that can’t be addressed by the solutions above. If nothing has changed at this point, you want to factory reset your Note9 to know if the problem is fixable on your level.

  1. Create a backup of your data.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  4. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, ‘Reboot system now’ is highlighted.
  10. Press the Power key to restart the device.


If factory reset fails to resolve the issue, it must be caused by something deeper. Based on our years of experience, an issue like this is hardware-related, probably due to a damaged charging port. To fix it, you must let a Samsung technician check the hardware. Bring your phone to your local Samsung Service Center, or call them so you can get instructions on how to ship the device to them.


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