12V ledstrip doesn't work with powerbank

[Forsete]

So in short, I have a 12V LEDstrip and a powerbank that has a 9V/12V USB port and if I connect the LEDstrip to that port, it doesn't seem to work.

The powerbank I use is the aukey 10000mAh. The LEDstrip is just a cheap RGB LEDstrip that works with 9-12V. It does work when I power it with a 12V adapter that I just plug into the wall, but because I want to make it portable, I want to power it from a powerbank. So I cut open an old USB cable and connected the VCC and the GROUND cables to the breadboard, but the LEDs simply do not turn on. What am I doing wrong here?

 

[Forsete]

MERGED QUESTION
Question from Forsete : "ledstrip 12V ledstrip doesn't work with powerbank"

So in short, I have a 12V LEDstrip and a powerbank that has a 9V/12V USB port and if I connect the LEDstrip to that port, it doesn't seem to work.

The powerbank I use is the aukey 10000mAh. The LEDstrip is just a cheap RGB LEDstrip that works with 9-12V. It does work when I power it with a 12V adapter that I just plug into the wall, but because I want to make it portable, I want to power it from a powerbank. So I cut open an old USB cable and connected the VCC and the GROUND cables to the breadboard, but the LEDs simply do not turn on. What am I doing wrong here?

One post per topic plz

http://www.tomshardware.com/answers/id-3416154/ledstrip-12v-ledstrip-work-powerbank.html

USB is 5V, not 12V

USB is 5V, not 12V

In the specifications it says that 1 port has 5V/9V12V

 

[little_me]

Yes, the quick charge port, whose voltage depends on the receiving USB device to SUPPORT it, they (battery and receiving device) negotiate the voltage.
Cutting the cable does not mean voltage negotiating and thus you get just standard USB 5V

Edit: to say it in other terms:
You connect usb device to the quick charge port with usb cable.
Battery pack uses said USB cable to say, "Hello! I can give you 5V, 9V or 12V, if you want"
If the device supports quick charging, it replies and Battery up's the voltage on Vcc as requested.
If device doesn't reply (like you cut the cable) Battery assumes that it is old device and supplies just 5V.

USB is backwards compatible from 3.1 to 2.0 to 1.0 so.. no reply means dumb 1.0 device which just feeds on power and assumes that it is 1.0 standard's 5V.