Review on MakerHawk USB Load Tester - Intelligent Discharge Resistor Module for Battery Capacity Testing, Adjustable Constant Current, 150W 200V 20A by Chris Owens

Ideal for checking chargers or cable quality. I combine this with a voltmeter/ammeter tester to see how much more power my battery pack can handle and how good the charge quality is when shopping for new cables, batteries and wall chargers. I bumped this thing up to 5.0 volts at 4 amps and it got a little warm. The fan came on and I could tell it dragged the system a bit, but once it settled down it just dissipated the heat faster. Definitely worth the money if you are looking for a good USB A/C/Micro Tester. Would definitely buy again and will be back here as a gift soon.