150W 4-Wire Electronic Load Tester 2.4 inch DC Tester APP Electronic Adjustment Constant Load Lithium Battery Capacity Monitor Discharge Charge Power Meter Supply Checker

This load tester is not really easy to use and setup. But once you do enough finger pushing, the data derived from testing is easy to capture.Too bad the app doesn’t work. It would have been cool to graphically plot the power and voltage during the discharge (CC mode). I’ve decided to write my own app to display that information.Above is a screenshot of the completed testMy application is that I’m testing various MAH’s of different configurations and cell chemistries. Turns out the performance of these new AA’s configured to crank out 3400 mah (at constant 1.5 vdc) are all smoke and mirrors. Even at very low discharge rates, they only have 1500 mah. Still very usable, but not as expected. So far, ENELOOPS are the winner. Exactly as advertised, 1800 mah to 2000 mahThe app does let you export to xls files. Be careful, if you close the app and then reopen, data is only from when you reopen. I’ve lost hours of data by closing the app. Can’t add to the export, only date, amps and volts are exported. It would be nice to add internal temperature and capacity. It could use some work.The load tester works better than expected. Would love to see the manufacturer team up with a great app writer.Added December 2022:Have found additional ways of utilizing the versatility of this clever load tester. Testing multiple batteries in series and then adding the additional mah to short cell.Wish someone would fix the app. It could be a gem if fixed to adapt for battery testing.

Used the tester, and while it performs well, I find it a bit pricey for what it offers. The 2.4-inch display is clear, and I appreciate the app integration for easy adjustments.However, the responsiveness could be improved, and for the cost, I expected a bit more. It’s a solid tool for DC load testing, but consider your budget before purchasing.

The instructions were just terrible. They are written in very broken English by a possibly Chinese person. If you don't already know what you need to do with this device you will be lost and out of luck.

I seemed to have bought a lemon. I contacted Amazon and they are only claiming responsibility for the return if the package was damaged during shipping. it did not appear damaged but never turned on. The seller reached out to me after an extended amount of time and sent me pictures on how to plug in the power chord!!! That was insulting, he asked for a video of it not working. cant send it with only 10mb of email data. I tested the power going from the supply into the board and the power was present at the pcb.The retailer never responded after I said the power was going into the board. I let them know a bad review is coming for a non functioning product that they will not return. Again, I did not get a response from the seller. No resolution and I am out 70$ . I threw it in the garbage where it belongs and bought 2 ET5420 dual channel load testers that work flawlessly and have a great case and display layout. They are also sold by a different supplier.

The more and more batteries I get for various reasons the more I've wanted to test their capacity. I've been able to connect this to my computer and use a Python script to log the output so I can chart the values. So far everything has worked well.The only reason I removed a star is that I'm not sure how long the screw terminals are going to last. They seem pretty flimsy. It would also be nice to have a minimum fan speed option so that you could just fix it on a nice low setting rather than having the fan go on and off when the selected current is fairly low.I've used this to test a few different LiFePO4 batteries, some battery banks, and USB power supplies. I've been able to determine which of my power supplies are best for a Pi. I also used it to prove that some of the off-brand fake Ryobi batteries on Amazon are in fact 0.5kWh rather than the 3.0kWh they advertise to be. So far those are the only tested batteries that didn't come out as expected.

I am using this to load test 18650 batteries. It is easy to use and I appreciate all the output given on the screen. So far, I have only run up to 30 Watts and the fan is very quiet there. At 8 Watts the fan isn’t even needed, so unsurprisingly it is extra quiet then ;)

Easy to use.

The tester works great, but I would like to see an option for a case with plug in cables and better software. Overall it is a good value for the money,