Something weird..

Dr. Dickie

Dr. Dickie

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Sep 23, 2020
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So, I finally got in my LiFePO4 cells, and so far they are great! I did find something weird when testing the IR.
I have two RC 3563 testers and one Y 1030+.
When trying to test the IR of these cells (280 Ah EVE cells), the RC 3563 would not give a consistent reading. It would bounce all over the place. It stayed below 0.25 mOhms which is the spec. but it would not settle on a value no matter which one I tried and how many times I tried. On an 1850 cell, it is fine.
The Y 1030+ gave me a reading and was pretty much rock solid (they were all 0.15 to 0.19 mOhms).
Very strange. Just wondering if anyone else has seen this same behavior?
 
I've seen the same behavior with the RC3563 with some 18650's
Slowly lowering the IR reading until it settles at a value after half a minute, sometimes bouncing around. But thats always just with old & used cells with either very high IR or low capacity.
 
Oberfail said:
I've seen the same behavior with the RC3563 with some 18650's
Slowly lowering the IR reading until it settles at a value after half a minute, sometimes bouncing around. But thats always just with old & used cells with either very high IR or low capacity.
Click to expand...
Yeah, these have low IR. Kinda amazed that the Y 1030+ worked so well. Think I am going to stick with it from now on.
Thanks
 
In the video it looks like it's just "easier" to measure on the plates as there are convenient holes in the housing!
That said, the posts would be welded/attached to the plates & the plates would be "more directly connected" to the cell's core "wound foil".
So it would be fractionally less IR on the plates vs the posts.
Nice looking battery pack though right?
 
Dr. Dickie said:
the RC 3563 would not give a consistent reading. It would bounce all over the place. It stayed below 0.25 mOhms which is the spec. but it would not settle on a value no matter which one I tried and how many times I tried. On an 1850 cell, it is fine.
The Y 1030+ gave me a reading and was pretty much rock solid (they were all 0.15 to 0.19 mOhms).
Very strange. Just wondering if anyone else has seen this same behavior?
Click to expand...
Maybe the 3563's probe tip metal to metal doesn't like the eg those particular nickel plated battery terminals as much?
 
Redpacket said:
Maybe the 3563's probe tip metal to metal doesn't like the eg those particular nickel plated battery terminals as much?
Click to expand...
I think it just was too low of IR for 3536 to measure. I was doing it the same way. I think the cells have aluminum posts. The metal probes appear to be the same. The 3536 would just go crazy, while the 1030 had no problem at all.
 
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