Adjustable Constant Current Electronic Load - 150W USB Electronic Load Battery Capacity Tester USB Resistor Load Multimeter Voltage Current Tester Voltmeter Meter Amperage Reader 0.2-25A 2-200V

I'm in the process of building a 100Ah LiFePO4 battery pack for the 48v Torqeedo outboard motor that I have on my pontoon boat (I live on an e-motor only lake). I first discovered this device being used as a battery capacity tester in one of Will Prowse's YouTube videos. It looked like an affordable / easy option for confirming that the batteries I bought did, in fact, have the advertised 100Ah . . . so I clicked on his link to the Amazon store. When I got here, I saw the newer version available and went for it! Note again: this review is for the "New upgrade" purple version. A few comments: 1) The device is working great! I attached a picture of the 6th consecutive cell that I am running through capacity testing. A little smoke rolled off the device when I started discharging the first battery, but stopped within a few seconds. The resistors on the sides of the heat sink get pretty hot when discharging at the 20A I'm using for this cell (0.2C discharge rate), so I expect it was some residual solder flux burning off. In any case, it didn't affect operation in any way that I can see and it hasn't repeated since the first run. 2) The separate discharge and voltage measurement terminals are a must! The discharge terminals measure ~0.4 volts less than the voltage measurement ones due to resistance in my leads (likely the fuse - your results may vary), which would significantly affect measurements. It's a must-have feature, in my opinion, and the older version (the one Will used) doesn't have it. 3) There is a PC app that you can download from a janky-looking website (accessed via the QR code on the back of the device) so you can monitor / control the device from your PC. I'm not trusting enough to install something like that on my PC so I can't comment on it, but the pictures looked pretty cool! 4) No instructions were included with the device. However, the QR code on the back of the device brings up a site (the one referenced above) where you can download them. Unfortunately, there are several downloads there and no indication of which is the correct one (use DL150B). Worse, they are written in VERY poor English and are incomplete! For example, if you want to erase the data from a previous run, you need to press the button and encoder down at the same time until "Data Erase" shows up. Hold them for a moment longer and it factory resets. Neither function is indicated in the instructions. Nor is any information on how to use this kind of device. If you don't know how to use it, don't buy it until you spend some time on YouTube watching people use similar models (I couldn't find any videos with this version). You're likely to hurt yourself or someone you love!!! In summary, great little device if you're tech savvy and one of those people who only resort to instructions as a last resort. You will definitely leverage those "figure it out on my own" skills here! If your using the instructions as your sole method of understanding the device, good luck! Looking at a lot of the bad reviews, I'm guessing a lot of those folks were in this category. I'm on cell #6 now, but will update my review if anything changes before I get through cell #20! Peace!

Although I received the item as promised, it was damaged and I could not get the screen to display any of the parameters. Totally blank. Not the fault of the company

The unit is working as it should, but the back light was not functional I had to replaced it myself , it's annoying , and my backlight is not exactly the same size

The product is accurate and works well, but it did not come with any instructions on how to use it. Here is a summary that I compiled after experimenting for a while Power comes from 6-12V at the barrel jack. A 12V 1A supply is included. Settings stick through power cycles. System setup Press/hold button to enter setup mode then press knob to cycle between settings, rotate to change. First click rotating doesn't do anything. Settings auto-save after 10 sec, then exits setup mode after 5 more sec. or long hold to save & exit setup. Current settings are in (parens) Stop voltage - Set this about 0.2V below desired stop point. (10.2) Max voltage - System will stop or not start if voltage is above this (14) Max Watts - Stops if Wattage exceeds this, system max is 150. (75) Max Fan temp - Stops if heat sink temp is above this (74) Max battery temp - Stops if battery temp is above this (44) Timer On/Off - If on, stops if time limit is exceeded (OFF) Second click sets limit Fan on temp - Fan turns on when heat sink exceeds this in Deg. C, stops when 10 Deg cooler (52) Backlight Brightness - 0 -10 (2) Beep - Beeper On/Off (On) Style - Display style while running A numbers only, B with battery graph (A) Run setup Press/Hold knob to enter setup mode. Short press to select setting, rotate to change Mode - Operating mode CC const. current, CV const. voltage, CR const. resistance, CP const power. (CC) Don't use CV with batteries! BAT - Run no. 1-10 to select this run or review previous. Value - for selected mode .1/1/10/.001/.01 units to count (1.000, adj by 0.1) Operation Press button to start or stop. Can adjust current with knob while running. Auto stops and shows message after any limit exceeded. Press button to display run time, AH, WH. Press button again to start next run. Increments run no. so previous results are saved but not visible. Press/hold both button and knob to clear all results. This does not change settings.

No instructions were included.