Why is usb charging slower

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This is covered by the power delivery specification. This means they can deliver up to 2A 5V and many smartphones make use of higher currents. Now back to the PC. And because its much cheaper to use one power supply, all three ports are connected to the same one.

But the problem is that the device "talks" to the hub by using mA and then both arrange the higher current or mA depending on the USB version. So to answer the question: Charging from the computer is slower because both devices comply to the USB specification.

But if you fool the device so it thinks its connected to a power supply it can consume its maximum from the hub. For that you need an adaptor called "fast charge adaptor" that shortens the data lines example 1 , example 2. So a computer port is not limited to or mA as stated in other answers. The limitation comes from the spec. Note: There exist exceptions.

For example mobile devices like ultrabooks are allowed to share the one port minimum for all ports. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why is charging from computer using USB slower than using an outlet? Ask Question. Asked 10 years, 9 months ago. Active 4 years, 3 months ago. Viewed k times. Improve this question. Fitri Fitri 2, 7 7 gold badges 26 26 silver badges 37 37 bronze badges.

Not an exact dupe but check out this question android. And suddenly you realize that this way of charging is taking almost twice as much time. In many instances, the cable is doing all the heavy lifting. In order to address this, we prepared a list of possible solutions for the problem. Make sure to check them out below. The main difference lies in current output, which is around — mA 1 or 2 amps for a wall socket charging and no more than — mA for USB 3.

USB 2. But, surely, not as much as 5 times slower, which seems to be an issue with certain users. So, look for a small lightning icon beside the port to identify it as powered, downstream port — the port you can use for charging. USB 3. But in order to charge your phone with USB 3. However, if your handheld device is a bit older and the cable supports only USB 2.

Of course, as a final note, you must confirm that both your cable and USB port are in a working condition. The number one reason your iPhone or Android smartphone is charging slow is because of a bad cable. USB cables get dragged around and beat up quite a bit and most people never even think to replace the ones that originally came with their devices.

Thankfully, USB charging cables are easy and cheap to replace.