According to your test I asked you to do first but finally decide to do it at last, your result is lower than the cell rating that indicate to me that it is probably not a new cell but I cannot prove it. I will let you the benifit of doubt. If I take for granted that your chager is accurate, it is the first result that I see that is right. If you had done it when I asked you, we will not be at this point about talking of your integrity.
I have done many tests 1-2 months ago with the Opus because a member (Sledgestone on CPF) asked a question about why his Opus gives higher capacity mearurements than the specs of the cell. My charger did the same but I never bothered with that. Four-five days before he asked this question, I have received the MC3000. I decided to do some test to find why we have these high results and give me the chance to test the 3000. All my test I did before (opus) were higher (I keep all the pictures of my measures). I tried the MC3000 in Advanced mode to do many test and I set it according the setting of the Opus. All my results where near the lower range spécifications of the cell with the 3000. I did it with brand new (1 cycle because these cells were tested when I received them with the opus (around 3500-3600mah for a B cell)) and around 3150 with MC3000). I have to find why. I set the 3000 according the measured setting datasheet for these cell as said before. At that point, the results of the 3000 were target. I reapeated the same thing with GA, LG Mj1, HG1, Eneloop Pro, Eneloop ordinary with always the same results.
I decided to try to find results to see if I was my Opus or a general tendancy. I went to AliExpress, the place where I buy my cells, to check the feedback section of the sellers. All the results I have seen from 3 sellers showed me that their results are all higher than the specs of the cell (posted above). Some a bit higher than the high end (3250-3350mah at 25 Celsius rating specs of the cell) and some, like mine, more higher. I did not found any that show me the opposite. I concluded that the Opus measures higher capacity than the cell rating.
Your last test above shows me the opposite and this is the first that I see with this result. Like I said, I must take for granted that you used a new cell. With an old cell, that cannot prove anything. I will leave you the benifit of doubt. At that point, I cannot say that the Opus is accurate in the capacity measurements as I said before. All I can say, it is a trend to measure higher if I take for granted that your charger is accurate. I cannot prove it is not because I did not test your charger.
If you could find results from other people at the place you want and a place that I can go to see them (amazon-Ali…etc, I will have to admit that my statement was wrong. But for now, with all the test I saw and I did, I could not say that.
The Opus is a very good charger as I said before. This is my second charger since I have the 3000. One of its flaw, it is its capacity to measure the capacity of the cells. Another inaccurancy, for the Opus, I saw on mine and according to what I read, is the reading of voltage. Straight at the end of the charge, you see 4.20v on the display but If you take a DMM, you have good chance to see 4.22v but it remains in the spec. accurancy of the charger.
We asked members to try the charge test by themselves but only one did it. His result was higher than the cell rating but target with his mc3000.
I would like to have seen more results though with the LiitoKala also to see the difference.