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How To Fix Samsung Galaxy S9 Slow Charging Problem

Posted by Robert Hayes on July 12, 2019
Samsung Galaxy S9 and S9 Plus

If you are using a Samsung Galaxy S9 you are probably enjoying the many powerful features of this high-end smartphone. One of the nicest features of the Galaxy S9 is its battery, which is either a 3000 mAh battery or a 3500 mAh battery depending on the exact model. This gives the phone a usage time of between 27 and 31 hours, and a standby time of 3.5 to 4.0 days (depending on app usage, network signal strength, use of WiFi, and many other factors.) However, some users have complained that their S9 does not charge quickly enough. In this article, I will talk about some common reasons for slow charging, and give you suggestions on resolving this problem with your phone.

Hardware Reasons for Slow Charging on the Samsung Galaxy S9 

There are four basic hardware-related reasons that your S9 could be charging slowly, and I will explain each of them in turn. In order of increasing probability, the issue could be:

  1. There is dirt, dust, or debris lodged in the charging port.
  2. The power adapter is damaged or faulty.
  3. The USB cable is no longer working properly.
  4. You are using the wrong power adapter for your phone, or a weak USB port.

Dirt in the Charging Port

After using your charger for a while, it’s possible that dirt or debris is stuck inside the charging port, blocking the connectors, which is making it difficult for your Samsung Galaxy S9 to charge quickly. You can use a toothpick to clean up the dust, but be careful not to cause permanent damage to the charging port. Inspect it with a flashlight first, be gentle, and work slowly. You don’t want to break anything and you don’t want the toothpick to break off in the charging port. Avoid using compressed air to clean the port, as it can be too forceful. You can try blowing in the port to clear out very light dust but do not get moisture in the port when you do so.

Damaged Power Adapter

If the issue is a result of a broken power adapter, you can be certain by checking your device screen. Whenever you plug in your charger, there is always a message that says ‘fast charging is enabled.’ This message notifies you that your power adapter is working properly to quickly charge your Samsung Galaxy S9. If you can’t see the message when you plug in your charger, then you should consider replacing the power adapter. If nothing else, replacing the power adapter isn’t going to hurt anything.

Faulty USB cable

To be sure that the issue is with the USB cable, you can use another USB cable from a colleague or friend (so that you will be certain the problem is with the cable) to test if the issue persists. If a different cable solves the issue, then that will let you know know that its time to get a new USB cable. Luckily, they aren’t expensive and can be found on Amazon or in basically every department store or dollar store.

Wrong Power Adapter / Weak USB Port

The little cubical power adapters that we all use to charge our phones and devices look like they are interchangeable, and in terms of ports and plugs, they are; you can put pretty much any charging cable into pretty much into power adapter and get a charge out of it. However, the adapters are NOT interchangeable; they deliver very different levels of power to the connected cable. Your Samsung Galaxy S9 expects to get 5.0 volts at 2.0 amps – a total of 10 watts of electrical power. Many common power adapters deliver only a fraction of that power; if you have your Samsung Galaxy S9 plugged into an adapter that’s providing 5.0 volts at 1.0 amp, it shouldn’t be a surprise that it’s going to take a long time to charge your phone.

In addition, while you can plug the USB cable into any powered USB hub to get a charge and skip the adapter altogether, not all USB ports are created equal. There are USB ports that will provide 5 volts at just 0.5 amp, all the way up to 5 volts at 5 amps (which is too much for your Galaxy S9 to handle, and may damage your battery). It’s much more typical for a USB port to be “weak” and only deliver a half-amp of power, which is just a trickle for your phone and not enough to rapidly charge it.

Software Reasons for Slow Charging on the Samsung Galaxy S9

In truth, the issue is almost always going to be hardware-related. However, it is theoretically possible that you have a software issue that is causing slow charging.

The basic reason that your phone’s software could be causing the problem is that if too many apps are running, causing the phone to use up nearly all the power coming through the charger, it may charge only very slowly.

Clearing the Background Apps

There are times when some apps will be running in the background of your Samsung Galaxy S9, and you won’t even know they’re. These apps can, obviously, drain the battery, and they can make your battery charge slowly and also consume your Samsung Galaxy S9’s internal memory. If you think this might be the case, then you should try to exit all apps, including the ones that you are not actively using. Or, you can even restart your phone to start afresh and see if that solves the slow charging issue on your Samsung Galaxy S9.

To Clear the Background apps

  1. Click and hold a space on your Home screen.
  2. Release your finger as soon as the list of recently used apps appears.
  3. Click on the Task Manager.
  4. Click on the option to End All Applications.
  5. Tap on the RAM option.
  6. Delete the RAM. 

Uninstalling the Third Party Apps

It’s possible that the slow charging issue is as a result of a new app that you just downloaded, especially if you aren’t having issues until shortly after you install a new app or an app updates. If that’s the case, then you are lucky, because you won’t need to uninstall all the third party apps on your Samsung Galaxy S9. Instead, you can just uninstall the new app and see if that solves the issue. If the problem persists after uninstalling the new app, however, then you will have to uninstall the rest of the third party apps on your Samsung Galaxy S9.

How to Enter Safe Mode on Samsung Galaxy S9

  1. Restart your Samsung Galaxy S9.
  2. Wait for a few seconds until the Samsung logo appears on the screen.
  3. You can then press and hold the Volume Down key of your Samsung Galaxy S9.
  4. A Safe Mode text will show up, and then you can release the Volume Down key.
  5. Move through the menu to locate Settings, select More, and enter the App menu.
  6. Click on the Downloaded category.
  7. Choose the third party app that you think is causing the issue.
  8. Click on Uninstall.
  9. Click on OK to confirm the process.
  10. After the app has been uninstalled, click and hold the Power key to restart your Galaxy S9.

The last method you can try is the System Dump. The System Dump method will give you a ROM image and allow you to fully restore your Samsung Galaxy S9 back to its initial factory settings. I will explain how you can carry out the System Dump process below to fix the slow charging issue on your Samsung Galaxy S9.

  1. Launch your Dial Pad.
  2. Press the code *#9900# on the pad
  3. Once a new page comes up, move down and click on the Low Battery Dump option.
  4. Click on the Turn On option.
  5. You will need to wait for a few minutes for the process to finish.

If the charging issue persists after you have tried all the tips and methods above, it’s possible that your Samsung Galaxy S9 needs a battery replacement.

Need more help with your charging issues? We’ve got the resources for you.

Here is our guide to resolving problems with your iPhone charging slowly.

Here’s a quick tip for any phone that’s charging slowly.

Here’s how to resolve a Galaxy S5 that charges slowly.

We can help you if your Galaxy S6 is charging slowly.

Here’s what to do if your Galaxy S7 is charging slowly.

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