Something weird..


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Dr. Dickie

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Sep 23, 2020
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339
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?
 

Oberfail

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Jun 22, 2021
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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.
 

Dr. Dickie

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Joined
Sep 23, 2020
Messages
339
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.
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
 

Redpacket

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Feb 28, 2018
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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?
 

Redpacket

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Feb 28, 2018
Messages
1,413
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?
Maybe the 3563's probe tip metal to metal doesn't like the eg those particular nickel plated battery terminals as much?
 

Dr. Dickie

Member
Joined
Sep 23, 2020
Messages
339
Maybe the 3563's probe tip metal to metal doesn't like the eg those particular nickel plated battery terminals as much?
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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