I needed a device to help with processing some second-hand/used 26650 LiFePO4 cells as I had a large number (hundreds) taken from various packs.
I looked for a DIY solution and found this one on hackaday, and ordered two! The devices came assembled and ready to go. OpenGreenEnergy was quick to respond to my questions. One piece of guidance with the tester, be sure to use large enough wires to power the board, and to connect to the battery, as it is able to draw up to one full amp from the battery under test! If the wire is too small, there will be a large voltage drop and the measurement will not be accurate. I recommend at least 16 gauge/1.5mm^2 wire.

It is a great board that is very useful for analysing the capacity of LiPo batteries. By choosing the discharge current, you can set the pace of the discharging process.
I am happy with the purchase. Mr. Amit from Green Energy was very helpful with the shipping process and answered my questions swiftly. He also added a nice personal touch by programming a personalized message that shows up when the device is turned on.

I bought this cool weather station project from this store recently! and I have installed it in my Lawn, just to catch up the weather parameters and enjoy the Open Source Project by Debashish Dutta. Before purchasing this product, I went through one of the review shared on this product, It feels like I was about to take the risk. But this order turned out to be really a great experience.
As far Quality is concerned! The Board was delivered in an excellent condition. Properly packed in an Anti-Static Pouch. Sensors and the Programmer were packed separately. No Shorts, No Dents and Great PCBA Quality is what I can say. The seller helped in programming the board and I am now able to use it with my Alexa and Debashish's Thingspeak dashboard. The battery charging works great but didn't get a chance to grab the Solar Panel, and so got it from PCBWay.
Parcel delivery was a bit late but hey, I didn't pay any customs even with EMS (I am surprised). So, going with EMS or DHL is my recommendation.
I got my 3D Printed Enclosure from the seller itself in the PETG Quality (For less than $120, The quality delivered is absolutely niche). The print quality couldn't be compared with manufacturers here in UK (Especially at the price). I shall definitely consider this seller for their 3D Prints.
The seller has mentioned a 4MB ESP32 in description but I got a 8MB ESP32 (Thanks for that). The sensors calibration was greatly achieved. I wish if Tindie could allow sharing the images.
As I am waiting for a V4 (Based on Lora), Till date this product deserves 5-Star, I really regret why some people didn't rate the work done by this great engineer. Hats! off to "Debashish" , Thank You for contributing to the open source community. My each spent penny, came with a great return :)
I hope this review shall definitely bring the true image of the seller. Thanks!

This little device is perfect for those of you who salvage 18650 cells and gives you away to group similar cells for projects. Very simple to use and straight forward if you know your electronics basics. I love the welcome message too! I am happy with this purchase, thanks!