Electronic Stuff

Creating a cable for fast USB charging

When I was in US last time, I picked a nice charger with it’s own backup from Amazon. It’s PowerGen charger with a storage capacity of 8400mAh with two USB ports for output (one with 2Amps output and other with 600mA with 5V standard USB).


This is a amazing product since 8400mAh is really huge amount power. My phone’s battery has a capacity of 1750mAh and theoretically speaking this can charge battery from 0 to full around 4 times. In practical experience I have tried for around 3 times during long flights. Never really needed to go beyond that point.
The charging cable which came with this charger has something special – It’s a “charging only” cable without any data connection capability. The charging only cable carries only “electrical connectivity” via + and – wires without any data pins (D+ and D- shorted). The advantage is that charging speed with this cable was really fast and I really enjoyed using it with external charger as well as my iPad’s charger which has a 2A output (which brings 2A x 5V = 10W power).
In theory these charging only cables give very fast charging because they don’t put USB data connection. A standard USB port on computer has power limits and device is signaled to pull more power via “shorted data pins”. Usually device is connected to 600mA or even less in data+charging mode, while such shorting brings power to max of port which is usually 1A for most of ports (and 2Amps for iPad charger).
Unfortunately connector of cable which came with my powergen charger went pretty loose.
Tonight I decided to make an extra data cable which was lying around into “charging only” cable by shorting it’s D+ and D- mins. It was pretty easy except that actual wires are really thin and I had slightly hard time in removing insulation without breaking them off.

Steps for creating a “charging only” cable

Step 1 – Pick a standard USB data cable

Cable before starting:


Step 2 – Cut it right from middle and peal off outer insulation

It will have 4 wires – Red & black (for electrical current flow), white & green (for data connection)


Step 3 – Now idea is to short the data pins (green and white) going towards phone while just leave white and green going towards USB port/charger side disconnected. Red and black should be connected as normal for electrical connectivity.


Step 4– That’s pretty much it. Just insulate final red and black connection in a way to make sure they never short.

This is how cable looks like in my case after shorting data pins and insulting it back.


That’s about it.

Back to work for now! 🙂

17 replies on “Creating a cable for fast USB charging”

  1. Thank you very much man!!!
    This tutorial helped me a lot solving a charging problem in the car with my Galaxy Nexus!!!

  2. Thank you. The slow charging time of my HTC One X (AT&T variant) while plugged into my computer vs OEM charger puzzled and frustrated me. And the price of the “fast charge” cables on eBay was too much.

  3. I my phone would discharge while plugged into a car charger while using GPS and dashcam apps. This solved it.

  4. good trick. i hope it works.
    from lil bit ovesravation i can see the charging speed has incresed but will it work same as normal charger charging or not that i will have to test.

    1. Yes, you can. Many of wall chargers have data pins shorted already and for them, this cable won’t show any difference. But for ones where data pin isn’t shorted this will show improvement in charging speeds.

  5. so what just connect D+ n D- to get fast charge mode?
    but if i using normal adaptor 5v 10A can i do that. what voltage shoud u set in my adaptor ( can be adjust from 4.5 – 6v)

    1. so what just connect D+ n D- to get fast charge mode?

      That used to be an issue back in days of early Android phones as well as Nexus that they needed to shorting of those pins to enable charging with 1Amp.

  6. Thank you !
    I just tested eigth 1m cables and seven 30 cm cables.
    I have here eigth chargers, two Android phones, one Android tablet and on Nokia 925.
    I have also two devices with display for V and A.
    The results are the same with all the chargers.
    All 1m cables give about 0.4A to Android but 1.3A to Nokia.
    most 30cm cables give 1.3A to Android and Nokia. Some give .’0.4A to Android but 1.3A to Nokia
    So. There is some connection inside those cables, which prevents the charger to give full powet to Android.

  7. I tried this on a generic usb cable that had yellow, black, green, and white wires. Shorted green & white on tablet side, checked yellow for continuity to outboard pin on larger usb plug, spliced yellow to yellow and black to black. Doesn’t work. It seems to be impossible to buy an OEM Samsung charge-only cable, and this fix sure doesn’t work with the cable I used. Very experienced with soldering, splicing, and heatshrink insulation, so I don’t know what’s up here.

    1. Hi Andan.
      It’s an old post and I have not really looked into how modern devices are behaving w.r.t fast charging.
      Anyways, thanks for sharing your experience.

  8. Can I use this method to create a “charge only” cable for my Apple devices (Iphone, Ipad, etc)? Thanks.
    Carlos A.

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