PEMENOL DC Electronic Load Tester 35W 5A， Adjustable Constant Current Aging Tester Discharger Voltage Current Power Battery Capacity Display， LCD 18650 Battery Charger Tester

Found all declared functions are actually here. I was able to set load current from 0 to 2.5 A, was afraid to set more current draw from my USB AC power supply as it may accidentally kill my source. At some moment built in fan controller started to turn on/off heat sink fan, but temperature of heat sink has been kept well below specified limit of 80°C. LCD display is bright enough, can be seen without external light.Some important warnings to potential users:- Don't try to use '+' and '-' buttons to adjust LOAD current. I was lazy to read manual at first and as a result unintentionally changed current meter calibration settings. Good feature of this device that it can be restored back using external multimeter.- Use galvanically decoupled power supplies. External USB power supply is required for device to operate and it should be decoupled (no common ground) from power supply you are going to test with this electronic load. Even if you accidentally forget about this requirement nothing serious will happen, only tester readings (both voltage and current) will be wrong.Pros:Ability to measure not only load power, voltage and current but battery current capacity as well (in mAh).Extra input to connect any two-wire power source under test (not just USB).Easily adjustable load current with multi turn resistor handle.Clear and bright LCD with back litCan be re-calibrated with external multimeterReasonable priceCons:USB power cord could support software control by PC over USB. But I suppose it would increase price for this load tester.Heat sink fan operates either at full speed or completely stopped. Linear control would be more comfortable, but for DIY purposes it's completely fine.

I liked that I could set it to provide a constant current load for testing small power supplies;I liked that I could use it to record battery amp-hour capacity;I liked that it can easily be powered from 5 Volt supply using micro USB cable;I liked that inputs for connecting to DUT include USB Type A connector and screw terminal strip;I didn't like that there were no instructions included on how to use it;I didn't like that when I did download instructions some were difficult to understand for some functions;I didn't like the obscure calibration procedure to correct voltage and current inaccuracy.All-in-all it will be a useful load tester if I am able to remember the intricacies of the discerned yet poorly translated instructions. All functions are not intuitive.

This is a wonderful little load tester, and I can't wait to test it's full capability.I have some old rechargable battery packs laying around and wanted to make sure that they will still perform well, I was able to test them with this to see how badly the voltage dipped when under their max load and this gave me all the information I needed.Pro's:Easy to use, very intuitive controls and easy to read displaypulls power from a separate source in order to not skew the data from the loadpotentiometer makes it easy to adjust the load to test for different conditionsshows amps, watts, amp-hours and time elapsed for all the data you could need.Up to 5 Amps or 35 watt capability, so will work for most small projects you would want to test.has a micro usb b connector for unit power or can be powered from the 5v padsCons:Wish it had a case for the unit as the pcb and all components are exposed. At least it has feet to sit on to raise it while powered onAll in all, a very good cheap unit that will find a lot of use in my shop.

I have been using this to capacity test some 18v Makita batteries, and it has worked very nicely. The accuracy is pretty good overall, and I think excellent considering the price of the unit. One key feature that this has that some of the more expensive/high power units lack is a low voltage cut-off - some just have an alarm, but don't turn off the load. This unit cuts the load and signals an alarm which is quite nice. The user interface is a bit clunky due to having only 4 buttons, but is reasonable once you get used to. I have tested the undervoltage, over-power, and (accidentally) the reverse polarity protection. Everything works as expected. It does get pretty toasty, so I did have an extra fan blowing over it when I was running it at 30+ watts, but I don't know if that is required or not.It's a great value for the twenty dollars it cost.

I bought this to test 18650 batteries and other small loads. It worked great for a few weeks and then stopped applying a load all of a sudden. I contacted the seller and after some useless back and forth emails they stopped responding. Very disappointed with longevity and customer support. I like the flexibility and function control for different load types and cut out limits, I just wish it had lasted longer.