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Green Sony cells just suck
#1
So Ive tested probably 1000 18650 cells so far from laptop packs and noticed a disturbing trend in the green Sony cells.  Most test pretty decently on the initial discharge cycle test (between 1900-2200) but on every single capacity test after that they steadily lose 100-200 mAh per test so I would imagine it would be impossible to balance a pack with these.  This is not a case of inacurate Opus with value jumping up and down by 100 mAh or so, this is a clear trend in the downward direction by 100+mAh on every cycle.

I now recycle all these cells and if I start opening a pack and see green Sony I just stop wasting my time on that pack.  A little disappointing as well because I had a lot of these in my "good" pile before I noticed the issue with them.

Do any of you notice this same trend?  

I cant imagine Im the only one because the packs were from different manufactures and different years but all the same result.
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#2
Good point. Thanks for bringing it up so we can keep an eye out for them. Can you go over to the Cell Database and make a note on those too? That way others will see it when looking up data on the cells
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#3
How many cycles did you do? It would be interesting to see if there were an end to this loss. What revision opus? Could it be that these cells do not like going down to 2.8v
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#4
(05-04-2018, 01:26 AM)Geek Wrote: How many cycles did you do? It would be interesting to see if there were an end to this loss. What revision opus? Could it be that these cells do not like going down to 2.8v

You make some good points.  Ive only done a maximum of 4 cycles because I only have 4 Opus chargers and I want to keep moving on processing cells plus by this point they are already below capacities I am interested in.  My Opuses are all version 2.2.

(05-04-2018, 01:20 AM)Korishan Wrote: Good point. Thanks for bringing it up so we can keep an eye out for them. Can you go over to the Cell Database and make a note on those too? That way others will see it when looking up data on the cells

I will certainly do this.
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#5
You mean you're actually able to test yours? 90% of the cells I've been harvesting, even from new old-stock packs, have 0V so I can't even test them.
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#6
(05-04-2018, 10:45 AM)mike Wrote: You mean you're actually able to test yours? 90% of the cells I've been harvesting, even from new old-stock packs, have 0V so I can't even test them.

damn thats unlucky, ive had maybe 3 packs below 0.05V Big Grin
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#7
(05-04-2018, 10:45 AM)mike Wrote: You mean you're actually able to test yours? 90% of the cells I've been harvesting, even from new old-stock packs, have 0V so I can't even test them.

Yeah and most looked awesome on the initial cycle.  After I figured out what was happening I had to go back and pull a hundred or so out of my good pile, pretty disappointing.
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#8
Damn. I will have to pull all my Sony's out before I start welding my packs up. Thanks for the headsup!
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#9
(05-04-2018, 01:04 AM)jm1 Wrote: [...]
Do any of you notice this same trend?  

not me.  this 10s12p pack is 100% sony from used laptop batts.  bad luck mate.



and they're all 'triple tested' for capacity.

rodagaster likes this post
--    ----    ----    ----    ----    ----    ----    ----    ----    ----    --
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#10
I've only had experience with the "green" Sony US18650 G5 and G6 and a couple of G8 and so far have not noticed a reduction in mAh capacity on cells with an IR of 70mΩ or below on subsequent charge and discharge cycles.


The G5 I only have 33 cells in the database but it looks as if the IR cutoff is around 78mΩ for at least 80% capacity.


The G6 I would definitely make 70mΩ my cut off although there are some stragglers at >80mΩ just hanging on I will re-test those in the future.
An occasional dip in the acceptable range but that's to be anticipated.



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If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
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Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
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