Remember to use the SHORT CABLE that comes with this powerbank. The short cable gives you consistent 1800 GCC reading (see post 3) while the long cable is only about 1000-1200.

What the best deal for power bank u guys got or the best?

Rm145 for yoobao thunder cheap?  I want buy

I have experience with data cabling. It looks like twisted pair to me, and the shielding either protects against signal crosstalk, or grounding, or maybe both.

In the case of 2A, perhaps grounding is an important part of the equation?

Is the shielded core made of solid conductor or twisted strand? Data transmission needs solid conductor, but electrical transmission is fine with twisted strand.

External strand is for grounding. The internal sleeve is for data integrity protection (reduce external signal interference). So this cable is what is known as Shielded Twisted Pair (STP).

STP has better characteristics transmitting data over longer distances than UTP (Unshielded).

All this helps DATA. Charging wise, I have no idea, except that if the conductor material is good quality, we expect better charging qualities.

What "speed" do you mean? Data transmission speed or Charging mAh speed?

Should be a purer copper I guess. Same goes for Data transmission. Conductor quality is important.

Last thing. Could you shave off the insulator on one of the USB signal wires (doesn't matter red/black/green/white)? Is it single conductor or strand conductor?

Just curious as I haven't done much soldering in awhile.

All, somebody provided this link yesterday:

http://www.righto.com/2012/10/a-dozen-usb-...b-apple-is.html

Excellent article.

I added it to post 6, but please let me know who submitted so I can acknowledge.

It's added to a new category called Charger and Charging Related.

brotan you may want to take a look at this article.