Galaxy J7 won’t charge battery to 100%, shuts down on its own after booting

The #GalaxyJ7 is one of few non-flagship Samsung devices that provides topnotch performance just like the more expensive S and Note lines. But just like any other smartphone today, it’s not immune to power- and charging-related problems. Today, we bring you two reported cases wherein the J7 has failed to charge properly and boot up normally. We hope that our suggested solutions will be helpful.

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When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

Below are specific topics we’re bringing for you today:

Problem 1: Galaxy J7 won’t charge battery to 100%, shuts down on its own after booting

Hi there! Today I started having issues with my Samsung Galaxy J7. I was attempting to use it when it turned off. So, I plugged it in to charge thinking it was a low battery issue (it would from 15% to 0% in less than 5 minutes). I left it turned off and charging for about 30 minutes. When I went to turn it back on, I was able to read and respond to a text message, before it turned off again.  I continued to charge it but anytime I go to turn it on, it starts to boot up but then will turn back off.

Sometimes I’m able to open an app, like messages but can’t send anything before it shuts off again. Sometimes I’m unable to open any app before it shuts down; but it immediately restarts, unless the battery is too low.

I have tried to use different chargers to see if that was a problem and have attempted a soft restart (twice) but to no avail. I’m not sure what’s going on. Immediately before it started turning off and on non-stop, I noticed that all of my apps that are saved to my SD card were not loading. Please help me! Thank you in advance! Sincerely, Teacher in Despair. — Jennifer

Solution: Hi Jennifer. The symptoms are all consistent with a failing battery so you’ll probably end up buying a new battery. Before you do that, it’s good if you can eliminate any possible software causes so these are the steps that you can try:

Recalibrate the battery

Android operating system can sometimes lose track of true battery levels leading to premature shut downs. This can happen after the device’s uptime or the period the phone has been running without a restart, is stretched for a long time. At times, poorly coded third party apps can also result to similar situation. To fix the issue, one must simply help the operating system get correct readings of the battery levels. To do that, follow these steps:

  1. Drain the battery completely. This means using your device until it powers down by its own and the battery level reads 0%.
  2. Charge the phone until it reaches 100%. Be sure to use original charging equipment for your iPhone and let it charge up completely. Do not unplug your device for at least two more hours and also don’t use it while charging.
  3. After the elapsed time, unplug your device.
  4. Perform a warm restart by holding the Power and Home buttons simultaneously until the Apple logo appears.
  5. Use your phone until it completely ran out of power again.
  6. Repeat steps 1-5.

Check for third party app problem

As mentioned above, apps can cause problems too. If you are the type who install apps impulsively, there’s a chance that you may have installed a problematic one. When it comes to installing apps, it’s good if you do research about it first. Checking reviews from other users might also help to give you an idea on what product you’re letting in your system. Some apps are disguised as legit ones but once they’re inside, a developer can do whatever he/she wants. Some are used to steal personal information, others are used to monitor your browsing habits, while some may allow other malicious apps to be installed without your knowledge. If you don’t pick good apps at first, you only have yourself to blame once any of these problems occur.

Still, other apps may provide the promised task but their developer may be inexperienced. Apps built with insufficient resources and/or experience often winds up causing problems with other apps or with the operating system. To see if you installed one, you can restart the phone to safe mode. While in this mode, all third party apps and services will not run. If the phone charges normally and boots up fine, that’s an indication one of the apps is causing the trouble. To identify it, you must invest time in doing the cycle of uninstalling an app and observing the phone. Do the same cycle until you’ve pinpointed the cause of the problem.

If you haven’t tried booting to safe mode before, here’s how it’s done:

  1. Turn the device off.
  2. Press and hold the Power key past the screen with the device name.
  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’.

Return all software settings to their defaults

Should there be no change after you’ve tried the first two steps above, you should consider doing the more drastic solution called factory reset. As the name suggests, this solution will force all settings back to their factory state, which is normally bug free. It’s an effective solution in eliminating bugs that may have developed over time. To factory reset your J7, kindly do these steps:

  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. Turn off the device.
  3. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
  4. When the device logo screen displays, release only the Power key
  5. 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).
  6. Press the Volume down key several times key to highlight ‘wipe data / factory reset.’
  7. Press Power button to select.
  8. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  9. Press Power button to select and start the master reset.
  10. When the master reset is complete, ‘Reboot system now’ is highlighted.
  11. Press the Power key to restart the device.
  12. Set the phone up again and observe how charging and booting up work before re-installing any app.

Replace the battery

Should nothing improves after a factory reset, you can assume bad hardware is to blame. Before you decide to send the phone in, try to use another J7 battery. If you know someone with the same phone as yours, try to borrow his/her battery. If that’s not possible, bring the phone to a repair shop who may be able to test the battery. If a technician will say that the battery is bad, replacing it should fix the issue. However, if the technician will say that the battery’s good and working, there must be another reason for the problem. Unfortunately, this also means that you’ll have to send the phone in for repair. Depending on the problem, it may cost you a couple hundred dollars at the least, especially if it involves motherboard replacement.

Problem 2: Galaxy J7 won’t charge, charging stuck at 92%

I updated my phone with the new software and ever since my phone will not charge and I don’t know why. I have brought several chargers and still not working. It say charging but it’s not charging my phone. It said’s 92 % every time. I really don’t want to buy a new phone. If the battery is more than I have to get a new phone. — Christyglamar12

Solution: Hi Christyglamar12. If you’re positive that the issue occurred right after you updated the software, wiping the cache partition and/or factory reset may help fix your issue. These solutions are accessible after booting your device to Recovery Mode so below are the steps on how to do that:

  1. Charge the phone for at least 30 minutes.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy logo 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. You can either wipe the cache partition or do a factory reset when in this mode.

If you can’t fix the problem after doing a factory reset/master reset, consider replacing the battery.