MakerHawkElectronic Load Tester - USB Load Tester 150W 200V 20A Resistor Adjustable Constant Current Battery Capacity Tester Module Intelligent Dischar

It's working fine for me.Some people have stated that it only worked once or didn't work at all. I think that people aren't reading the instructions and starting it up without turning the current knobs all the way down (counter clockwise), or turning the power up too high (over 150w) and frying the MOSFET. If you happen to let the smoke out of the MOSFET, it can easily be replaced.

There are two versions of this product - one is set for a maximum load of 150 Watts the other is set for 185 Watts. I received the 185 Watts version, however, you can change the maximum. I tested my 48 Volt trike battery. As I increased the load current to 5 Amps the battery voltage dropped to 10 Volts - yep, the battery is bad. When I reduced the load, the battery went back to 48 Volts.

I purchased this the test USB battery banks for Amazon reviews. The portable power supply type battery banks that you would carry for emergencies. When connecting the bank to USB C input absolutely NOTHING happens. It will not start the test regardless of what i try or how adjust the knows or the alarm settings. It may work great for testing batteries but USB input is a function it is supposed to have as well and it does not work at all!

I, and I would imagine like many of you, got to this product by Will Prowse - the solar and battery guru of YouTube. Anyway, this thing works really well. I immediately tested all four of my LIFEPO4 batteries, and I'm happy to say that all four tested well over the specified/advertised parameters! It took a while too - overnight for each battery (100ah each). I will say that at 185w, the unit heats up WAY TOO much! At 185w it was at 68 degrees Celsius, when I lowered it to 160w, the temp dropped to 55 degrees - that's a pretty significant drop in temp. It did increase the time to deplete my batteries, but I was not worried about leaving this run overnights. There are a lot more menus available - if you unplug the unit, press the button (the only one) and keep your finger on it while plugging it back in, you'll get a menu to change a lot of settings - so you may want to explore that. So far, it's working well and it is very accurate (as compared to my Fluke meter and another smaller more inexpensive meter). I don't know what it will be like long-term, but so far so good. As long as it dies within an acceptable amount of time, I'm pretty sure I'd buy another one.

Works well, easy to use. The USB test leads fried themselves with very little load on it. It works fine with the screw-on leads, but lessened the overall usefulness without the USB leads. Overall a fun tool that lets you test any kind of battery for actual real-world capacity.

The voltage is read properly when no load is applied. Once a load is applied, it drops by about 10%. Yet a separate voltmeter connected to the battery still reads the correct voltage. Wondering if this throws off capacity and wattage calculations..

Very easy to use. You have to make up your own battery cables or do what I did and repurpose cables from a 12v inflator/jumpbox that went belly up.The device is limited to 185 watts (it’s just a smart heater). You can test an entire battery or individual cells.Videos detailing the actual use are found on the web. Essentially, the two silver knobs have to be fully counterclockwise before starting. Top is coarse adjustment and bottom fine adjustment. Start with top to get close to 185 and the fine to get as close as you can.Don’t go over as the device will alarm and you have to restart. With a standard 100Ah battery, you’re looking at 7.5 hours of runtime.You can see in the photos the data that is displayed while discharging and the end result. You’ll likely find your BMS will cut the battery at approximately 11.04v if you are testing a 12v battery.

Works as I needed it to.