[Apple MFi Certified] MYOHO High-Capacity 6000mAh Portable Power Bank with attatched MFi Lightning Cable + 1 USB Port. Lightweight, Durable, Sleek. For Smartphones and Tablets. TWELVE MONTH warranty!
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The joyshare Advantage: powered by our leading technology. Reversible Connector: USB-C's user-friendly design lets you insert the connector the right way, every time Backup Charging: Use any phone charger, portable charger or multi-port USB charger to charge your new MacBook, ChromeBook Pixel or other USB-C devices via this cable. What You Get: joyshare USB-C to USB 2.0 Cable (3.3ft), welcome guide, our fan-favorite 12-month warranty and friendly, easy-to-reach customer service. High Speed Syncing: Transfer data to and from all your USB-C devices at speeds of up to 480 Mbps
Most Helpful Customer Reviews on Amazon.com (beta)
I checked spec compliance of this cable using a Type-C breakout board and a multimeter. I confirmed that Vbus and Gnd lines are not crossed by confirming +5V instead of -5V between Vbus and Gnd pins. I also directly measured the CC termination resistor between A5 (CC pin) and A4 (Vbus). I found that this cable has a 56k' pullup resistor, which is correct. This cable will be recognized as "Default USB Power" by Type-C devices looking to charge.
When I plugged this cable into my Chromebook Pixel 2015 and an Apple 12W 2.4A power adapter, I found that Pixel was unable to ramp up to 2.4A. Instead, with this cable, Pixel is only able to ramp up to about 1.7A of charging.
This cable violates Section 4.4.1 of the Type-C specification as well for Cable IR Drop requirements. According to Section 4.4.1, the voltage drop from one end of the cable to the other end must be to more than 500mV at the maximum rated VBus current capacity, which for Type-C cables should be 3A .Similarly, Gnd IR drop maximum is 250mV.
I did a direct measurement of this cable's Vbus impedance using a high precision LCR meter, and I measured an impedance of .172'. Since V = I * R, and I must be 3.0 according to the Type-C spec, this is translates to 516mV IR drop across this cable, which greatly exceeds the 500mV impedance limit defined in the specification.
I also did a similar measurement on Gnd and I found 0.167'. This is 501mV, which also exceeds the 250mV maximum.
This will translate into MUCH slower charging from this cable than other Type-C cables as too much voltage is dropped in the wire itself. My Pixel was only able to ramp up to 1.7A of charging before the voltage drop at the Pixel side forced it to stop ramping.
In conclusion, this cable won't do serious harm to your chargers or devices, but it is a poor quality cable that is too long for the thickness of wire used inside the cable. Longer cables, for example this 3ft cable, must use thicker wire in order to keep the effective resistance to within correct levels for fast charging. This cable uses wires that are too thin for the length to sustain 2.1 A or 2.4A charging.