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  1. D

    Grad Student Looking for Research in used Lithium 18650 Cells

    Hello, I'm a first semester graduate student in the USA and I have recently gotten super interested in Lithium Batteries! I have a ton of used 18650 cell's I've harvested from all sorts of products and while I was building an E-bike battery last year I was beating my head against the wall trying...
  2. A

    Need help identifying 18650 cells

    Hello everyone, I was going through my assortment of cells and found some (6) that I cannot find any data on. Here is a picture of one of the Cells: The Text on them says: N18650 T11R R02S The last set of numbers varys from cell to cell (16119, 16174, 16175, 16129, 16419 16207) Does anyone...
  3. A

    Question about battery pack

    Hello everyone, I have a battery pack (from an electric lawnmover) that I want to rebuid. One of the cells has gone bad (measuring 0V and it looks burn or something leaked below the red tape). The pack consists of 10 LG LGDBHE21865 Cells and works out to 36V 2,5Ah. Since only 1 cell is bad...
  4. Emiel

    [CLOSED] For sale in the Netherlands (EU): 17 kW powerwall kit

    Located in the Netherlands, Europe. Pickup only, no shipping. Who will finish my Powerwall project? Build your own powerwall of 18650 cells? I'm selling you a set that will kick start your project! Average capacity of the cells is 2800mAh. The cells are individually tested on an Opus BT-C3100...
  5. The Kilowatt Challenge

    Megacell Chargers & RC3563

    Hi all, Video discussing the changes I've made to cell processing now that I'm using the Megacell Chargers and an RC3563 @Wolf gets a shout-out as well! ;-) Cheers all, Darren a.k.a. -> @The Kilowatt Challenge
  6. Y

    52v 13Ah 14s5p - new - Austria (ship to EU/Russia)

    Hi people 🙂 if any one needs: - 7 cycles, 1.5 month old - 52v 14s5p 13Ah - new is sold for 380$ - I’m in Austria: can ship to EU, Russia, Switzerland • send me your offer 👌😊 I believe 190€ would be fair for such new pack
  7. M

    Test rig for SM8124A

    Using the SM8124A was always inconvenient to use, the wires are sturdy, a bit to short and you need more hands than 2 to use it with speed. So I made this simple rig for you guys and girls to enjoy, and maybe someone can use the idea as well. In the video you can see how it is used, but there...
  8. 1

    I have a stupid question

    How many mm of nickel strip do I use for 3S and 4S, and how do I put 3S or 4S in parallel
  9. M

    Question about Solar + battery + grid

    I can't seem to wrap my head around the complete system that is needed to manage the electrical switching side of a system with solar, battery and the grid. I am in the stage of building a 48 Volt lithium battery using 18650 cells. We are looking at solar panels with micro inverters (meaning...
  10. thunderheart

    My battery holder ver.4.0 with 4-wire connection support

    Hi guys. It's been a long time i didn't post here and here i'm back:) All this time i was thinking on making a new holder for my tests and eventually i've designed and made one which i'm ready to show you. Here it is - my holder version 4.0. All your thoughts are precious for me so don't...