Samsung Galaxy S8 no longer charges fast like before after an update [Troubleshooting Guide]

The firmware of your phone plays a big part in the charging process that’s the reason why your device may not charge if its system crashed. Some of our readers who own the Samsung Galaxy S8 contacted us asking for assistance because, according to them, their phone no longer charges normally after a recent firmware update.

So, in this post, we will tackle this problem with the Galaxy S8 being the subject of our troubleshooting. Let’s try to look into every possibility and rule them out one by one until we get to the point where we can easily determine what the problem really is. That way, we can formulate a solution that might fix the problem for good. So, continue reading this post if you’re one of the owners who have this kind of problem.

Before going further, if you found this post because you were trying to find a solution to your problem, then try to visit our Galaxy S8 troubleshooting page as we’ve already addressed most of the commonly reported issues with the phone. We’ve already provided solutions to some of the problems reported by our readers so try to find issues that are similar with yours and use the solutions we suggested. If they don’t work for you and if you need further assistance, fill up our Android issues questionnaire and hit submit.

How to troubleshoot Galaxy S8 that has charging issues after an update

Problem: I have a Samsung Galaxy S8 and my fast charging isn’t working. I haven’t used any different charger cord or block, it came with my phone. It takes 6+ hours to charge my phone and it started to happen after the new software update. I’ve tried other cords and blocks and it still happens. It’s very irritating because one night it worked and then the next it didn’t.

Solution: As you’ve been said that the issue started after the update, it is evident that the files and data may have been corrupted during the process and that may be the reason your phone is not charging normally. On the other hand, if numerous apps are running in the background that is also a factor why the battery is charging slowly because they also use the battery and that’s the reason why it takes several hours before the phone can fully charge. Now to begin our troubleshooting, here’s what you need to do:

Step 1: Force restart your Galaxy S8

Since the problem started after the update it is possible that a glitch in the system caused it. Through the forced reboot, the memory of the phone will be refreshed and all applications running in the background will be closed. So, if a glitch in the system caused the issue, then this procedure might fix it.

Press and hold the Volume Down and Power keys at the same time for 7-10 seconds and wait until your phone boots up. After doing so, connect it to the charger and observe if it is already charging normally. If not, move on to the next step.

Step 2: Reboot your phone in Safe mode and charge

Now try to find out if your phone fast charges or charges normally while in safe mode. There are times when a lot of apps are running in the background and they use up more battery. When it happens, your phone may resort to slow charging to let you know of the problem. Here’s how you start your S8 in Safe mode:

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.

If the phone charges fine in safe mode, then rest assured the hardware of your phone is fine and the problem is just caused by some third-party apps running in the background. In this case, all you have to do is reboot your phone in normal mode and it should charge normally now.

Step 3: Turn your phone off and try charging it

If the phone still slow charges while in safe mode, then power it down and connect it to the charger. When everything is turned off, the fast charging feature should come into play and you will immediately notice that. However, if it’s still not charging normally even if it’s turned off, then you have to resort to other methods.

Step 4: Wipe off the cache partition

When some of the system caches get corrupted for some reason and the firmware continues to use them, performance issues may occur including slow and/not charging issues. In this case, all you have to do is wipe the cache partition so that the system will replace all the caches. But the thing is, we really don’t know if it’s really the caches that’s causing the problem so we just have to wipe the cache partition to rule this possibility out.

1. Turn off the device.
2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
3. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
4. Press the Volume down key to highlight “wipe cache partition.”
5. Press the Power key to select.
6. Press the Volume down key to highlight “yes” and press the Power key to select.
7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
8. Press the Power key to restart the device.

If the phone is still not charging normally after this, then move on to the next step.

Step 5: Backup your files and data and reset your phone

As I said earlier, the firmware plays a big role in the charging process that’s why if everything else failed, we have to do the reset to finally rule out the possibility that this problem is just one of the firmware-related problems.

1. Back up data on the internal memory. If you have signed into a Google account on the device, you have activated Anti-theft and will need your Google credentials to finish the Master reset.
2. From the Home screen, swipe up on an empty spot to open the Apps tray.
3. Tap Settings > Cloud and accounts.
4. Tap Backup and restore.
5. If desired, tap Back up my data to move the slider to ON or OFF.
6. If desired, tap Restore to move the slider to ON or OFF.
7. Tap the back button to the Settings menu and tap General Management > Reset > Factory data reset.
8. Tap Reset device.
9. If you have screen lock turned on, enter your credentials.
10. Tap Continue.
11. Tap Delete all.

I hope after you do the reset your phone will function normally, because if not, then you can visit the nearest shop in your area or bring it back to the store where you purchased it and ask for a replacement.

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