Fix: Computer charges phone slowly

Aleksandar Ognjanovic By: Aleksandar Ognjanovic
4 minute read
computer charges phone slowly

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Even though smartphone’s capabilities are expanding in an incredible succession, there are still limits. Despite the advancements in every possible hardware category, even the top-class smartphones need frequent charging.

Now, sometimes you can’t access a wall socket and you’re limited to USB charging through the PCs USB ports. And, suddenly you realize that this way of charging is taking almost twice as much time.

Now, that’s not unusual, but some users reported that they charge their phones for hours and they’re still far away from completion. That’s, taking into consideration the available current, way to much. In order to address this, we prepared a list of possible solutions for the problem. Make sure to check them out below.

Why your computer charges phone’s battery slowly and how to improve it

  1. Check the cable and USB
  2. Disable USB Selective suspend
  3. Unplug other USB devices and peripherals

Solution 1: Check the cable and USB

First, let’s expose the facts. Namely, both  PC USB and charger’s adapter provide the same voltage (5V), but the main difference lies in current output, which is around 1000 – 2000 mA (1 or 2 amps) for a wall socket charging and no more than 600 – 900 mA for USB 3.0. USB 2.0 is even weaker in that department.

Therefore, the charging process with USB on PC charging is much slower. But, surely, not as much as 5 times slower, which seems to be an issue with certain charges phone slowly

However, there are some other things we need to take into consideration before we can move on.

Not every USB port is powered, meaning: not every USB port can be used for charging. So, if you’re running an ancient PC configuration with an outdated motherboard, there’s a good chance that more than a few available ports can’t charge your phone. So, look for a small lightning icon beside the port to identify it as powered, downstream port — the port you can use for charging.

In addition, as we already stated above, there’s a difference between USB 2.0 and USB 3.0. USB 3.0 in ideal conditions, can reach up to 900 mA output (0.9 A), which is mostly OK. USB 2.0 is stuck at 500 mA, which isn’t great. But, in order to charge your phone with USB 3.0, you’ll be needing a proper cable. Most cables nowadays are micro USB to USB 3.0. However, if your handheld device is a bit older, and the cable supports only USB 2.0, charging via USB 3.0 won’t make any charges phone slowly

Of course, as a final note, you must confirm that both your cable and USB port are in a working condition. Try an alternative cable or port and look for changes.

Solution 2: Disable USB Selective suspend

Now, once we dealt with that, let’s check certain power settings that might affect the charging process. Or, to be more precise, one advanced power option called USB Selective suspend.

What’s USB Selective suspend? This is an advanced power option that, if USB ports are not used, enables PC to enter low-energy idle mode. Now, this USB activity concerns only data and not charging. Meaning that, if you plug in your device and select ”Charging only” mode, your PC will, sooner or later, enter the idle mode and the current output will decrease. Thus, the charging process will last for ages.

Follow the instructions below to disable ”USB Selective suspend” in the Power settings:

  1. Press Windows + I to summon the Settings app.
  2. Open charges phone slowly
  3. From the left pane, select Power & charges phone slowly
  4. Click on the ”Aditional power settings” in the top right corner.
  5. Click on ”Change plan settings” under the preferred power charges phone slowly
  6. Choose ” Change advanced power settings”.computer charges phone slowly
  7. Expand USB settings and then USB selective suspend settings.
  8. Under ”Plugged in”, select Disabled and confirm charges phone slowly

That should improve the charging process, at least marginally. In addition, there’s only one more thing you can do to focus power on charging rather than allow your PC to spread it out to various devices.

Solution 3: Unplug other USB devices and peripherals

Finally, we can’t skip on the fact that motherboard output current heavily depends on how many devices you plugged in. Basically, if you plug in a mouse, keyboard, and phone, the motherboard can allocate only as much power to charge your device. And, power-wise,  mice and keyboards aren’t exactly heavy consumers.

So, in order to improve charging, make sure to unplug all peripherals (the ones you can function without during the charging process) and let your PC ‘focus’ only on phone.


  • Good and compatible cable is fundamental.
  • Your battery health is also a factor.
  • Some USB ports charge faster, some slower. Try multiple.
  • Disable USB selective suspend.
  • Unplug other USB devices and peripherals while charging.
  • Not USB nor Wireless charging are close to wall socket charging in regards to speed.

That should conclude it. Make sure to share your questions or suggestions with our readers. You can do so in the comments section below.



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