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Reviews (38)
Aug 11, 2018
One of the higher-capacity contenders in a very broad field of power banks.
This Power Bank looks good in print, and it is for the most part. It is stylish, nicely made, compact, and just a bit on the heavy side. Price-wise, it's quite a value for the listed capacity. This specifications need to be understood, however. 50,000mAH is the equivalent of supplying 50 amps for an hour, and that's a lot of power. This is rated at 3.7V, which is the voltage of the internal lithium stack, and works out to 185 watt hours. After the unit turns the internal 3.7Vdc into 5Vdc out, you'll be getting less than 40,000maH, assuming an unlikely 100% efficiency. No surprise, just not obvious.
A feature you need to be aware of is this Power Bank, like most, shuts itself off if the current drain is too low. This is not a problem for charging a cell phone, but it can be if you want to use this product to power a low-current device such as Arduino or Raspberry Pi. I wish there was a way to bypass the auto-off feature. A few brands can do this with something simple, like a long press of the ON/OFF switch.
I am giving 4 stars because the first unit I received had a faulty micro-USB charging connector and would not charge. It was replaced.
Jun 20, 2018
A good value in a generic USB 3.0 adapter.
This is a generic USB 3.0 adapter, It is "Plug 'n' Play" with Windows 10, although a driver CD is included. I bought this particular board because I needed the 20-pin header to connect to a pair of front-panel USB 3.0 ports. Five additional ports out the back helped seal the deal, as compared to other boards that have 2 or 3 such ports. Everything works. Only negative I can think of is there was no Molex-to-SATA power adapter included, but these are available for a couple of dollars. If you don't have one, order at the same time. Haven't tested transfer speeds yet, but it seems pretty quick.
Sep 09, 2020
Works really well with a pair of 18650 batteries.
To cut to the chase, this motor controller does exactly what it promises without any drama. I am using it as part of a DIY motorized telescope focuser. The speed control has worked fine with several battery configurations, including 4xAA alkaline, 4xAA NiMH, 1x9V transistor battery, and 2x18650 Li-Ion. Motor uses a gear train and can be varied down to about 2rpm, which is barely noticeable. Screw terminals are tight and hold wire leads firmly. Red LED on the circuit board tells when the board is receiving power. Speed control knob has an OFF detent to completely remove power. First few degrees of shaft rotation is a "dead zone," which is to be expected. To mount the control shaft through a panel, about 32mm of depth is required behind the panel. . .