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

No As a capacity test, this is actually pretty accurate. I'm on my 3rd right now as they seem to keep dying. I don't change the max power setting of 185 and stay below 160 but they still die. This will be the 3rd and last. I'm going the other way. It's easy to use, convenient and, as we said, pretty accurate.

I believe the minimum load is around 50W, and most people will be using a much higher load most of the time, so it's not that big of a deal. Test them out as a package. Remember that your load and time will be approximately 50% of the results with 2 cells, 25% with 4 cells, and so on.

This item seemed PERFECT for testing my battery packs and LifePo4 cells other than me and I could do not cause the device to discharge the elements. The unit appears to be defective and after months of delays in responding to my queries and 4 separate attempts the seller has done nothing leaving me no choice but to warn others!

I bought this and was unable to use it immediately due to BMS delivery. After setting everything up with the BMS I tried to check the capacity of my 24V 120Ah Lifepo4 battery. The display shows the current voltage but when I try to start the test I cannot increase the draw. Everything stays at 0. Since the return time has expired I'm stuck trying to figure out what's wrong. I would recommend gathering everything before purchasing this product if it doesn't work like mine.

Features multiple connectors for testing various standard PSUs as well as screw terminals. Reading was clear except some things were written in Chinese. The load adjustment knob to set the current was a little touchy and difficult to set to a specific current. The fan only worked when the tested voltage was loaded. The cooling fins were easily bent and the fan blades were exposed, so care must be taken to protect these parts. Every chance helps. Universal burden.

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…

I think it's a good load tester and it's really handy, basically it's a big adjustable resistor with a screen. The big problem I have with this is a misperception of the accuracy of the voltage readings. It doesn't have an accuracy of 0.01V, it's more of a resolution of 0.08-0.15V. The picture shows that the multimeter readings are (correctly) off by 0.1V. It's one thing when the product was specified to be 0.1V accurate, but it's listed as 0.01V and that's not true. Another thing: Based on…

Like many of you, I received this product from Will Prowse, YouTube's solar and battery guru. Anyway, the thing works very well. I immediately tested all four LIFEPO4 batteries and am happy to report that all four have been tested beyond the stated/advertised levels! This also took some time - one night for each battery (100 Ah each). I will say that at 185 watts the device gets too hot! At 185 watts the temperature was 68 degrees Celsius, when I lowered it to 160 watts the temperature dropped…