DZS Elec Mini USB 0.15A-3A Electronic Load Tester Module Adjustable Constant Current for 3.7V~13V 15W Continuous Discharge Intelligent Discharge Resistance Ageing Discharger Power Bank Tester

This load tester works great for use with USB meters that can test cables like the ct-3. I was struggling to test cables until I used this USB load tester. It works exactly as you would expect. The current is very consistent which is a requirement for testing cables with usb meters that can do that.The only thing that would make it better is a case so I created a snap fit case for this. If you have a 3d printer, you can get the stl files as I made them freely available on the Printables website. Just search for 'USB Load Tester Constant Current Snap-Fit Case (15 Watt)'.

I use this in conjunction with a USB tester to check suspect USB cables. Works well, fan is quiet. Doesn't get hot enough to worry about it sitting on a bench top. Fan cycles as needed to keep it reasonably cool.

I got the 2 big resistor version - and it does exactly what it says it will do. Problem is (and one of the questions hints at this), there are some battery control modules that CLAIM to provide 1 amp of current, but don't really - making this useless. Spend the extra money and get one that allows you to adjust down to .5 amp and up, that way you can use it with more type of power banks.

If you need a specific synthetic load for testing a USB power supply, this will do the trick. The pair I ordered came attached to each other, and took a little work to break them apart. No big deal. My DMM seems to think they're doing almost exactly what they should so that's a plus.Just, one word of warning... The things gets (unavoidably) HOT quick so don't touch the underside with your bare fingers if you can help it.

I wanted to make this to work with the USB Safety Tester, so I could verify the actual capacity of battery banks, cellphones, etc. This is so much better than finding all the parts and assembling myself!Works great, I can now tell what it takes to charge a cell, I can tell how much charge a batter bank can deliver. Because of this usefulness, I've ordered a larger battery bank (have a new device that needs more than my old bank) of higher capacity. When it arrives later today, I'll use this to drain it down, then watch the charge current and record the mAh to fill it, and know what it can hold. Then test what it can deliver to my new hungry USB charging device.

This is a handy tester for charging. It may be a bit tricky for discharging. It actually regulates drawn current to fairly low voltage, some 3.5 V, before it stops working. This may not be an issue when discharging a power bank that shuts itself down when its own set-point of safe discharge is reached. Testing batteries without protection may lead to discharge beyond safe limits.

As far as I know this thing only has one real use, and that's to combine it with a USB meter to drain USB power packs and measure their true capacities. That's what I used mine for, and it worked great. The built-in fan does a decent job of dissipating heat.

As described load USB port up to 3A. Worth of money.