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Zanflair,Opus and LiitoKala Tests
#1
Greetings,
 
So I decided to purchased 4 brand new Samsung 25R batteries and test my charge discharge setup.
Here are the results of the test in a spreadsheet.
Opus seems to have the edge on rated capacity accuracy but lacks in the mR department. The mR readings seem to be closer with the wire mod.
Zanflair is consistently high (8% to 11%) but seems to be more accurate in the mR readings.
LiitoKala is running the test right now and tonight I will have the results also the mR seems to be consistent.
Anyone want to guess the outcome of the LiitoKala mAh test?
Also does anyone have a clue as to the discrepancy between the 2 testers? Different voltage cutoffs maybe?
But I thought this would be an interesting experiment so now I label all batteries with the mAh and put an O, Z, or L next to it to let me know which unit the results came from and can adjust the powerwall build accordingly.
Although a 10% (to the highside) deviance is really not that much. Thoughts?

Wolf

jm1 likes this post
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 3/23/2019
Total Number of Cells           3743
Cells  >80% of Capacity        2445
Cells <80% of Capacity         1265
Cells ≥2200mAh & ≥ 80%     1709
Google Drive for info https://drive.google.com/drive/folders/1...sp=sharing
Not your average Wolf       
            Cool



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#2
WOW, no one replied. Well I'm interested in the results. I use the Opus 2 and the Liitokala. I'd love to know if there was a discrepancy.
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#3
I will know tonight and post the updated spreadsheet tomorrow AM.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 3/23/2019
Total Number of Cells           3743
Cells  >80% of Capacity        2445
Cells <80% of Capacity         1265
Cells ≥2200mAh & ≥ 80%     1709
Google Drive for info https://drive.google.com/drive/folders/1...sp=sharing
Not your average Wolf       
            Cool



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#4
(11-20-2018, 09:14 PM)lane5625 Wrote: WOW, no one replied. Well I'm interested in the results. I use the Opus 2 and the Liitokala. I'd love to know if there was a discrepancy.

We're waiting on the last test results Wink
Proceed with caution. Knowledge is Power! Literally! Cool 
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#5
Nice test... the only thing I would like to see in addition to all of that is the same test conducted with a good quality calibrated hobby / RC charger to see how close these chargers get to the actual capacity of the cell.
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#6
The results are in so far Opus and LiitoKala are the winners.
With LiitoKala the winner at this point with good mR and mAh readings.
Zanflair has inflated mAh readings IMHO but this could be due to a different discharge profile. Although we do know that the original batteris are 2500mAh raited and that is what they should test as no matter what, at least that is what I think.
Crimp Daddy I will run this test also on a Hobby charger. I do not have one so give me your choices of good, better, and best and I will purchase it and continue this test. Obviously price is a slight concern but not a deal breaker.
I will also test the ZB206 and the ZB2L3 boards in the near future. Too cold in the shed to be soldering and cutting Lexan.
Any other chargers/testers anybody want to have included in this test let me know and I will try to get it and run the test $ in my account willing as I do not have unlimited funds. Smile
I’m also thinking of ordering another LiitoKala as I think 2 of each is a good consistency test
OK here is the Spreadsheet.

 
Wolf
camthecam likes this post
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 3/23/2019
Total Number of Cells           3743
Cells  >80% of Capacity        2445
Cells <80% of Capacity         1265
Cells ≥2200mAh & ≥ 80%     1709
Google Drive for info https://drive.google.com/drive/folders/1...sp=sharing
Not your average Wolf       
            Cool



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#7
@wattwenger

I've used a few over the years and I recommend iCharger if you are looking to buy one... they are pretty dang good.  Something like a 106B, 206B, or X6 would be more than enough to test single cells and then some.

They have models that range from $90 to $400... but my experience had been good across the board.  Lots of capability and features even on the smaller models.

I do like than you can calibrate these things if you dont agree with the voltages, along with the features and more control over voltages on charge and discharge when compared to other models.



Wolf likes this post
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#8
OK Crimp Daddy choice is between 106B+ and the X6. I’m leaning toward the X6. I will buy on your recommendation either one but not both. Big Grin
 
Then I will run the test on all 4 batteries individually and document the results. This then could be our baseline to calculate the results of off the shelf units. Hopefully my pro 18650 holders will be here by then.
Also what do you mean adjustable? I understand that you can set the max charge/discharge V and also the Amps but what I am trying to do is duplicate the testing procedure of a nonadjustable off the shelf tester to determine the accuracy of them comparatively to each other. I certainly am not going to check 2000 cells 1 at a time it would take me a year of Sundays to get even close to a powerwall build. The idea is to be able to test cells en masse and be confident that your mAh readings are at least close. I also understand the theory that if you test with the same testers that has the same deviation that your results although wrong will be consistently wrong. OK maybe I’m a purist with OCD with a touch of Asperger but I don’t like wrong results no matter how consistent.
That being said I do see the advantage of these icharger/testers when a pack is built, to be able to test the pack and recharge to a storage voltage. Also when you have Xp6S packs you can at least balance charge them as you go toward whatever you’re XS pack size will be. Mine will be 14S.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 3/23/2019
Total Number of Cells           3743
Cells  >80% of Capacity        2445
Cells <80% of Capacity         1265
Cells ≥2200mAh & ≥ 80%     1709
Google Drive for info https://drive.google.com/drive/folders/1...sp=sharing
Not your average Wolf       
            Cool



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#9
Personally, I like ISDT chargers and they are cheaper than the iChargers. I used the SC-620 which is 500W if you have a large enough power supply. Check them out!
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#10
I can’t comment specifically on ISDT and their chargers, I do have their balancing cell checker and think it’s pretty good.

My biggest comment / concern over the many years using RC chargers is customization and options… iCharger has always did a good job with that. Good internal resistance tester, granular control over cell voltages, ability to calibrate… just go through the manual and it’s pretty comprehensive. I consider it more of a battery TOOL than just a charger.

Can the ISDT set charge, discharge, and balance voltages as custom? For example a 4.14, 4.15, 4.16 termination on charge. External discharge and regenerative charging have been huge features for me. Being able to discharge at high currents has come in very handy.
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