How to troubleshoot Samsung Galaxy S7 slow charging issue

With its fast charging feature, the #Samsung Galaxy S7 (#GalaxyS7) is expected to fully-charge its battery quicker than usual that’s why many owners are complaining about slow charging issues when they notice the phone is charging at a normal pace.

By default, the fast charging feature is enabled on the phone but users can actually disable both wired and wireless fast charging options. But we received reports that some owners encountered issues like the phone isn’t fast charging while others said theirs are simply slow charging. Let’s try to take a look at this issue a little deeper to shed some light on the questions that’s in the minds of the owners.


Before going any further, here are a couple of problems we received from our readers that best explain the slow charging issue with the Galaxy S7:

My phone just takes too long to charge and I know it as a fact because the first few days I could fully-charge it in less than an hour. Now, it takes 3 to 4 hours of being plugged in before it reaches 90%. Did I get a bad unit or the battery needs replacement already? It is the new Galaxy S7, which I purchased brand new. Can you guys provide me some instructions on how to fix this? Thanks.

My Galaxy S7 isn’t fast charging and it worries me. I tried using the charger with a cord and I also tried the wireless but it’s not fast charging like it was before. Did I do something wrong? Is it a problem with the phone? Tried researching online and there are a lot of owners that also experience this problem so I’m kinda worried about it. Can you guys please help me.

If you have other issues with your phone, visit our troubleshooting page and find problems that are similar to yours. You may use the solutions we provided. If they don’t work or if you need further assistance, do not hesitate to contact us by completing this questionnaire.

Step-by-step Troubleshooting

There are problems we cannot fix on our own. The purpose of this troubleshooting guide is to determine whether the issue with your phone is minor and can be fixed by doing the basic troubleshooting procedures. Let’s try to rule out one possibility after another until we can square out what the problem is.

Step 1: Find out if your apps have something to do with the slow charging issue

There are two general categories for apps, pre-installed and third-party. Any of these apps can cause issues like this and while we can’t pinpoint immediately which one is the culprit or if they have something to do with it, we need to isolate the problem.

There have been a lot of reports suggesting apps cause slow charging problems because the more apps running in the background, the faster the battery drains. In this case, the apps drain the battery quicker than the phone can take in so even if you plug in the device, it will still take forever to fully-charge its battery.

Going back to isolating the problem, you need to boot your Galaxy S7 in safe mode:

  1. Press and hold the Power key.
  2. As soon as you can see the ‘Samsung Galaxy S7’ on the screen, release the Power key and immediately hold the Volume Down key.
  3. Continue holding the Volume Down button until the device finishes rebooting.
  4. You may release it when you can see ‘Safe mode’ in the bottom left corner of the screen.

You may have read something about viewing the Recent Apps screen and close all apps out. The procedure above does the same trick in one go, in fact, it temporarily disables all third-party apps leaving pre-installed ones running.

If the problem was caused by some third-party apps, then the device should charge (even fast-charge) properly in safe mode. So, while the device is in this state, plug it in to charge and see how fast it can replenish its battery. Since there are only a handful of apps running, there should be a noticeable difference in charging time.

However, if the charging is still slow, then at least one possibility has been ruled out. So, continue your troubleshooting.

Step 2: Turn off your phone and plug it in to charge

This step will help us determine whether the phone charges normally when there’s nothing running in the background. Assuming the first step was a failure or the phone still charged slowly, we are yet to determine whether the pre-installed apps have something to do with it or the firmware, the battery or if it’s a hardware issue.

If the problem was just an app or two or a firmware glitch, the phone should be able to charge normally when it’s off. It may even fast-charge considering the screen is off and that there’s a little chance the device will heat up.

In case the Galaxy S7 still charges slowly when it’s turned off, not charging at all or heats up while it’s plugged in, it’s most likely a hardware problem and as early as now, you should consult a technician immediately or you can bring the phone back to the store especially if it’s still a few days old so it can be replaced.

On the other hand, if your phone just charges fine when switched off, then it must be just a firmware issue and there’s a couple of things you can do or try to fix the problem. Proceed to the next step.

Step 3: Try deleting the system cache and charge your phone again

Others would suggest doing the system dump but I think this procedure can fix the problem especially if it occurred just recently and without apparent reason.

There have been reports of slow charging issues that were caused by minor or major firmware updates, unsuccessful app updates, and corruption of certain system caches.

Wiping all the contents of the cache partition is the best thing you can do at this stage, so follow these step:

  1. Turn off your Samsung Galaxy S7.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. Using the Volume Down key, navigate through the options and highlight ‘wipe cache partition.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes’ using the Volume Down key and press the Power button to select it.
  8. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

After wiping off the cache partition, plug your phone again and see if it charges fine this time. If not, there’s another procedure you should try below.

Step 4: Bring the phone back to its factory default settings and try charging it again

In other words, reset the phone. You don’t have much of an option right now and considering the problem just occurred without apparent reason, there’s a chance something must have gone wrong with some of the data. You’ve already cleared the system cache, so this time, try deleting all the data but of course, make sure you backup your important files, music, videos, photos. If you have a microSD card, transfer them in and remove the SD card. Then, remove your Google account and disable the screen lock so as not to trip the anti-theft feature and then follow these steps:

  1. Turn off your Samsung Galaxy S7.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.

NOTE: It doesn’t matter how long you press and hold the Home and Volume Up keys, it won’t affect the phone but by the time you press and hold the Power key, that’s when the phone starts to respond.

  1. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  2. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.

NOTE: The “Installing system update” message may show on the screen for several seconds before displaying the Android system recovery menu. This is just the first phase of the entire process.

  1. Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  2. Once highlighted, you may press the Power key to select it.
  3. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  4. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  5. The phone will now reboot longer than usual.

This is the last resort and it’s expected that a problem like yours will be fixed by doing this procedure, if not, then it’s time to visit a technician or return the phone.

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20 thoughts on “How to troubleshoot Samsung Galaxy S7 slow charging issue”

  1. I tried everything listed here except for the full return to factory settings. My phone was at 12% and was going to take nearly 7 hours to charge, I cleaned all of the grime out of the USB port and it went down to 2h 7min. Granted, I work in a very industrial environment with lots of graphite, etc. So I’m not sure how helpful this will be to everyone else, but it was night and day for me.

  2. My phone is extremely slow to charge whether it is on or off. I’ll plug it into the wall outlet using the original out of the box charging cord and adapter then the phone will tell me to use the original charger that came with the phone….uhhhh I am. So then I will unplug it and plug it in again…same cord and adapter…then I get a message saying that it is fast charging and will be at full battery in approx 60 minutes. I come back to check on it and it’s only charged 14% in 80 minutes.

  3. My Samsung Galaxy S7 is taking 8 hours to fully charge I tried everything I try to factory reset I tried other chargers I went to my friend’s house to see if it was the power I tried everything you guys can imagine it started like when I updated my phone with software like one day later I need help I’m really tired of having to charge it every day for the whole time

  4. Before resetting your Samsung galaxy s7 makesure the setting for fast charge is enabled press settings then device maintenance then press battery then press the 3 dots top right and press advance settings and then it brings you to fast charging settings makesure charger is unplugged as you can’t change fast charge settings with charger plugged in thanks. P.s then if all fails then contact Samsung support thanks as if this don’t help or the other comments above then it needs Samsung support thanks

  5. Over the last few days I noticed this problem. I did a factory reset and, even plugged in, while the apps are reinstalling, the battery is dropping. Cleared cache, turned off, etc. Nothing has helped

  6. Same here. After last update my phone is charging so slow. I think its detecting my phone is connected through usb like im charging from pc and not from outlet.

  7. my galaxy on 7 pro is not charging .it takes 1/2 an hour for increase of 1% charge,how to fix this problem.

  8. You can also try checking the port for dirt. That was my problem. Before cleaning the port: 7 hrs ’till fully charged. After cleaning: 1 hr 50 min

  9. After only 2 weeks my original equipment Fast Charger that was in the Factory Box failed. I know for sure that it is not the original equipment cable and not the phone. My wife has the identical SM-G930T phone which we used to test the Fast Charger.
    This happened overnight and when I touched the phone in the morning it was quite HOT. I am concerned that my battery was damaged due to the heat as now the time to discharge from 100% to zero is 50% of previous performance. Today the phone ran out of battery in 7.5 hours.
    Screen 34%, Android system 14%, Chrome 13%, Android OS 9%, Cell standby 9%, Audible 5%, Device Idle 4%, Google services 2%, Audio Services 2%, Gmail 1%, organizer 1%.
    I am charging now in Safe Mode (thanks for the instructions above) and if that doesn’t work will try charging with the phone turned off.
    However because of the hot-to-the-touch episode I’m thinking a warranty replacement would be the best approach.
    Any thoughts on this?

  10. Your article has helped me on several problems. It has of course solved my charging issue. Thank you!! This is the MOST DETAILED and comprehensive procedural step by step I have found. Thanks again Bro!!!

  11. Have visited Samsung Service Center almost everyday for 7 days. They reprogrammed my phone, updated the software, etc. One of the days, my phone charged for 1.5 hours and I thought everything was ok, but the next time I charged it, it charged 3 hours again. So I went back to Samsung, the last day I went there, they charged it from 5% to 100% within 1.5hours. I asked them what they did and they said they did nothing… I thought they did a magic!!! And so after that, I tried it on myself again, and behold it charged 3 hours again. I researched and came across with someone who made a comment that said he “screen off” his cellphone and that it charged 1.5 hours! I tried it and it worked!…. So I am now happy. Samsung was not even able to tell my try to “screen off”.

  12. If I put my phone on performance saving, it will not fast charge. I turned it on/off several times in and out of airplane mode. Had removed performance mode – icon shows it is in fast charging mode until I plug in charger. Tried a reset with no luck. Tried multiple confirmed fast chargers – which later – miraculously – starts fast charging again…

    I’m a solo backpacker and when out, keep my phone in airplane mode but stupid apps like Samsung Pay and bloatware FB apps keep running. Kills my battery bigtime. Fed up with l the bloatware

  13. Thank you thank you for your info on the Samsung S7 re wont charge i took phone to 2 different phone
    repairers they could do nothing would not touch it said to new and to hard to open it up ect ect ect
    any way followed your reboot and works find now

  14. None of these things worked for me. My wireless charger would work intermittently. In my case it turned out the USB cable that came with the charger was the problem. I swapped it out for the one that came with the phone. Problem solved! Make sure you use genuine OEM cables for this.

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