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Probably Sayno or panazonic There is a cell database here: https://secondlifestorage.com/index.php?pages/cell-database/ It has a UR18650F, but it lists a blue ring

Yes. I will have to vent it to allow cooling (fans) during summer. I have to get it, and then I can start laying everything out. Okay, it came. Now I need to get the time to put it together. Oh boy, more stuff to do.

I am currently sitting at home, waiting for the text to tell me of delivery of: https://www.amazon.com/gp/product/B0144DQNWW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 It will go into my plastic shed. When I get it in, I will decide whether or not I can squeeze 14 packs across the back...

Part of processing cells is checking for damage. I have processed about 2K of cells so far, and a handful or so were seriously damaged. Just a glance and you could see the cell was crushed--into the bad bin. A couple had a scratch, a serious scratch. The scratch was beyond just the PTFE...

This is the antenna I put together: Using poles like this: https://www.ebay.com/itm/NEW-32-FEET-Antenna-Tower-Mast-Pole-4-FIBERGLASS-LOT-of-8-FOUR-FOOT-SECTIONS/233660298681?hash=item36673d35b9:g:wjQAAOSw4PBdrIyv Although they were $60 dollars for 8 when I got them--don't know where those...

I only have about 100 more cells to process--then a month wait for the final ones to sit for self discharge test. Since I have cells sorted into 10 mAmp capacity (I know that is silly, but it is done); my plan right now is to start with the highest capacity bin (2780 mAhrs), and log the cells...

January 13, 2021 12:35am Departed Shipping Partner Facility, USPS Awaiting Item LOS ANGELES, CA 90040 Whoo Hoo!! Of course, I am just getting done testing all the cells I have. BUT, I will have these for projects going forward.

Yeah, I kinda figured that out after posting that. That is only for a cell building up a lot of heat. Thanks, still learning.

Is there a positive temperature coefficient (PTC) device in these cells as well? I am just learning about all this stuff, so I don't know if these cells come with one. Couldn't that also make the resistance shoot up? I don't know if they react fast enough to have caused the non-event. Or...

Hello, KN8G here. Right now the antenna is down, changed from a OCFD to a vertical. I stole the ideas for Callum (M0MCX) for an 80, 40, 20, 10 vertical. Put it together using the fiberglass military tent poles. 10 meter in height. Was a major pain to put up, then I have to take it down for...

So, am I not understand what is going on, or shouldn't it be (theoretically speaking of course), that the voltage of those cells were not high enough that given the resistance in the circuit they could not produce the necessary 2 A to blow the fuse--given the fuses were operational and properly...

Yeah, my understanding is, the 2170 cells were developed by Panasonic in cooperation with Tesla to replace the 18650 in their early model cars. They have used the 2170 in their cars over the last few years, but it seems as if they are the only (or at least the super-majority) of the users for...

The cell holder is well worth it, it makes things easier and more reproducible (in my limited experience).

If, chemist speaking here, a significant portion of the internal resistance (impedance) is the result of the resistance due to the movement of the lithium ions from anode to cathode( which I would think it should be), then IR being very temperature dependent makes perfect sense (chemically...

Almost there with you. I have about 160 more cells left to test. Of course, after the last batch gets capacity tested, then they have to sit for 25 days to test for self-discharge. So, I am about a month and a little over a week away from starting to make packs. Best of luck.

Not be a stickler (but I am), aren't those 2170 cells?

From what I have seen (very limited experience--around a hundred or two) the IR of the cells I have tested (2 years old) goes from around 38-29mOhms at ~2 Volts, to 35-36 mOhms at 4.2V. If I see a change much greater than that, goes in experimental pile. All this at room temp. Now I have ONLY...

Hello!! I run shallow well ground pump off my current solar set up (small with lead acid batteries). The pump runs off the battery. As you know ground water down here is only about 5-10' down. Even so, I had no end of troubles getting the correct pump. Finally I found a solar piston pump, and...

I made a million mistakes even though all the cells are the same. Can you imagine the mess I would be in if I had hundreds of different cells!!!o_O This was supposed to be my learning project, and I have. That was why I specifically started with as little variation as I could. And again...

Okay, I have asked a million questions, and everyone here has been great at helping me understand everything I did wrong. Since I have no knowledge to contribute, how about something a bit different than "Burning Down the House." The Joy of Sorting Cells--I should come up with the Zen of this as...