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Cheater My first pack was all Frankenstein. That's where you learn about IR, dates, and chemistry My 2nd, was all same cells as you LGGBM261865 easy peasy My 3rd is going to be all the same LGFBM161865 dito and my 4th will be all same cell. You learn and get the same chemistry and same cells if...

I still don't quite get this 'heater" thing why are people still getting heaters? This can be totally avoided by checking the IR of the cells first. Heater problem solved. I haven't had a heater in 2 years and yes I do process all kinds of Sanyos. Wolf

Sorting for optimal safety and power in a powerwall is your question. The best and safest way would be the same cells from the same manufacture, same date code, same IR. Obviously in your case that is not the case so lets take your 1000 cells and see which ones would make the grade. The...

If it has 6 spokes then it is a Sanyo UR18650FJ 2100mAh With the "Orange" insulator ring its the only possibility. The J can be very hard to read. I use a fat sharpie with a paper towel to highlight the numbers/letters...

If you are looking at that graph that was done in April 2020 so much has changed since then I have no idea why I was pulling 200W from the gid. It may have been one of those times my 2 GTIL were not adjusted just right and the battery voltage was at a a crossover point for the GTIL and one of...

I suppose you could run a fan off of the source load. In my case It was 4.2V to 3V. 3V to 12V boost do exist so yea I guess I could have done that. The only problem is that I would be tied to the limited input V range of the boost so I decided that 12V separate input would be the way to go. If I...

4.2 Volts 30A requires 0.14Ω So I pretty much home built a 0.14Ω resistor using 7 1Ω 100W resistors which calculated to 0.1428Ω. Actual is 0.153 so 27.5A. Close enough. Wolf

As promised real life tests and real life results. First the reference material. Isabellenhütte PBV-R010-F1-1.0 10mOhm 1% Resistor Here are the results: Tester IR Reading Isabellenhütte 10mΩ 1% min 9.9 mΩ and max 10.01mΩ % Accuracy RC3563 9.926 10 -0.7455% YR1030 10.01 10 0.0999%...

Interesting :unsure: I see you referring to the YR1035+ compared to the RC3563? Is the YR1035+ better with AC IR or DC V or both? If so then I feel another comparison test coming up as I have both of these. Specs for YR1035+ IR: 20mΩ 0.01mΩ 0.7%+7 (when ZR function is enabled) 200mΩ 0.1mΩ...

Looking good. Very nice project.(y) Just a side note while working on my cells in parallel tester I did an resistance check on the style of cell holders I believe you are going to use and was shocked😲 at the actual resistance. Almost 7mΩ. Maybe yours are different but if not I'm not sure how...

LOL you think your brain is scrambled, you should see mine. Right now I'm doing 1A per cell (3) C/D/C cycles. If the cells are all the same as in all same brand, same part number, same age, and same IR the discharge curve is flat. there is no crossovers. All cells discharge at 1A. First section...

I believe the Sony/Murata VT4 cells are NMC (Nickel Manganese Cobalt) hence the low IR. Hm I did buy them from a retailer though so they are "new" . I may have some used ones from power tool packs. I'll look. If you want a reaction between high and low IR just look at the second test I did...

LOL yes most of my seriously marginal cells have probably been melted down or recycled in some form or another. Nevertheless I just remembered I still have a some medical, laptop, and power tool packs I haven't opened yet. I want to put cells through the tester that we would likely use. I mean a...

I told a small lie I was going to test 3 good cells and 1 bad cell. This is where I ran into a problem. Trying to find a bad cell. I have a bunch of Sanyo "bad" cells but I wanted to stay away from them as not to give them a 'bad ' name. The other problem is that 90% of my cells are reasonably...

Yes I am aware of that thank you for pointing it out. I have every ferrule known to mankind and was going to do that before I did the permaboard. I may actually solder the leads directly to the INA260 to eliminate any potential resistance created by the terminal blocks. The screws on the other...

Now it's going to get interesting Here is what was inserted at 10pm est Edit: I forgot to mention C/D/C to 4.2V ,3.0V @1A Cell # Model mAh OPUS mAh IR V 41 UR18650Y 2000 711 91.31 4.153 42 UR18650H 1900 1537 53.23 4.112 43 UR18650E 2000 1874 37.28 4.13 44 LGDBB11865 2600 1641 60.01...

That's going to require a bunch of code writing and hardware that my aging brain is going to explode with. Nevertheless I am more than willing to try it with assistance from some brilliant sketch writer. I have no problem getting the hardware and such together. In the meantime while I wait for...

I will prepare the cells for testing and post the results.

on the simmer @ AliExpress added them to their RC3563 page when I asked them to ship me 4 of them. Reasonably priced but shipping cost sucks. Wolf

Noted! The journey has begun anew. Lets see what happens. To all .............................. I am building a matrix of cells to test. I have new, used and abused. So don't be shy to ask for a set of 4 to be tested. Just give me a set of parameters i.e. cell manufacturer, part number max V to...