I have think to that again. All my tests were done on a charge test. (C>D>C) and yours on a discharge only. I think there is a possibility of another “flaw” with the Opus.
I never did a test only with a discharge only to 2.80v to test it. What I think with your results is they could be different between these two test. An accurate charger must give the same results like the MC3000 does.
Could you try a discharge test as I asked before with the same cell you did it? I am 99.9% sure that your results will be higher than the discharge only you did above.
I can’t do this test for now, only in the next weekend.
@members
For the others testers who have the Opus BT3100 v2.2 or the Liitokala and want to try it, it would be useful to see your results. The Liitokala could be more accurate than the Opus to measure cells capacity.
I don’t do the ‘test’ mode since it takes a very long time to finish it without a break, and, call it a flaw or whatever, but the Opus, and I remember it now as I have not used the ‘test’ mode’ because of it, I get confused with the figures shown. IIRC, the numbers shown after the Discharge portion are actually the Charge numbers (that is why you are seeing a higher reading), and I think you have to wait for the last numbers to show to know the discharge numbers, and that is after the second Charge portion.
I have pointed this out the to this charger’s designer. I have made an example of the simplicity of my Maha C9000 that clearly shows ‘available capacity’ after a Test session.
This is the reason why I use the ‘Discharge’ mode only to get the capacity for I will be certain the numbers shown are surely the discharge capacity, and I can take a break between modes, or give the cell a longer break, etc.
If you have time, take the Discharge test and compare it to your MC3000, and I’m sure you will see a much closer result.
At 1A rate, my opus showed 3,450mAh after discharging a set of Sanyo GA down to 2.7V, and the same set of batteries in the MC3000 with discharge current reduction (similar to CC/CV but for discharge) of 50mA and down to 2.5V I only got 3,350mAh. But the numbers from the MC3000 were actually closer to various results from members with sophisticated testing equipment.
Maybe this doesn’t happen with every unit, But at less than 5% variation I don’t think it is an issue at all, if one isn’t looking for the ultimate accuracy.
The opus is actually much friendlier to use for basic tasks, doesn’t require too many button presses to get it working.
I just try it with the same discharge >D you did on my 18650b. My result is 3520mah at 2.80v. The charge test C>D>C I did before with this cell was 3502mah.(posted on cpf). On the charge test C>D>C at the end, you always have the discharge capacity because when it charges, the number doesn’t change. On the MC3000 v1.02, at the end of the C>D>C, you have the discharge at the end but you can see the capacity during the charge. At the last second, the display switch to the discharge capacity. To have the charge capacity, you must use the application for ios that shows only the charge capacity. This flaw in corrected in FW1.04. We will have the charge abd disccharge capacity at the end. We all waiting to update our mc3000.
I have near the same result in the Opus, on a C>D>C or a discharge >D only. 3520vs3502.
These results are too high as I said before.
I will try to post the photo of my >D test I just did.
IIRC, the numbers shown after the Discharge portion are actually the Charge numbers (that is why you are seeing a higher reading), and I think you have to wait for the last numbers to show to know the discharge numbers, and that is after the second Charge portion.
No your wrong. After the discharge, you are at 2.80. The capacity displayed is the discharge capacity.
Now, I will charge this cell with the charge and will see what we have at the end. I will take 3:20.
Edit: I try to have an accurate result but I can’t with the Opus.
On the MC3000, discharge, charge, CDC…all the results are the same and lower than the Opus ( discharge or a CDC) and on the specs of the cell.
Does it read high in all your cells, or only in that NCR-B so far?
Perhaps your specific Opus does read high indeed, as I have owned and used 5 (2 x v2.0, 2 x v2.1 and the v2.2) of them and never had a problem like yours.
I hope other members could chime in their experiences. The Opus has been already around with us for at least 2 years already and so far no complaints here in BLF on abnormally high discharge capacity reading.
All the cells tested, 18650GA, B, LG MJ1, HG2, Eneloop Pro, Eneloop regular….are too high with the Opus.
The B above is on charge now. I am sur that the result will be too high again.
As I said above, I saw many results with the Opus when people post their result with pictures in the feedback on AliExpress. All that tests started when Sledgestone asked why the results of his Opus always read too high.
These kind of questions and comparisons are almost as useless as “What’s the best charger for the money?” that we see all the time.
I have a bunch of chargers, and after reading through all of this I’m as confused as before and I’ve been doing this for a long time.
What the hell is a newbie trying to decide supposed to do?
Newbie answer - Both are ‘OK’. Both have problems. CHOOSE ONE AND LIVE WITH IT.
There is no correct answer.
Yes, and this the irony from it…once a cell is in my flashlight, I can’t even tell the difference in performance between the cell charged from a $4 charger compared to one charged by a charger that cost me more than a $100!
The spec for the Ga are at 25Celsius 3350min-3450max. at a currant of 670ma, no specified terminaison but terminaison cut off specified but for the B it is 65ma. You are target with your MC3000.
The results of your Opus is higher according to these specs but lower than mine with brand new Evva 3500 (GA), 3550mah, tested 2 months ago.
A charge is a charge. Playing with flashlights and cells is a hobby. The MC3000 is a good charger if you want to learn. All the parameters are configurable. It is easy to understand and the Advanced mode is the funniest.
If they could find a way to update ours now….
Edit: Start to play with yours, you will learn a lot in only some days.
The terms used in the Opus are not clear enough. It is more easy to use term CDC, C>D>C, >C….it is universal. The Opus and the Maha doesn’t use the same terms too. When we talk together and use the charger terms, it is not take long to be mixed.
you have not managed to prove me wrong. For your photos either. I can show you any results in a load or discharge as the charger displays the real-time capacity.
I asked you for a “test load” and you did not want to do it. The test load shows the total capacity only at the end of the discharge and continues to display it until the end of the load. If you have managed to prove that your charger is accurate, you would have been the first. It is possible that there are, I have not seen to date.
I brought several pictures took on AliExpress in the feedbaks sections, you could check if you want to. The results are higher than the capacity of the battery.
Conclusion: the Opus BT3100 gives a higher capacity than the cell rating.
Nobody has yet managed to prove me wrong. Some devices seems closer to the max limit than others, but are still higher than the maximum limit that is between 3250-3350mah for a 18650b cell at 25celsius. It’s the same thing with the GA, LG HG1, MJ1, Eneloop and more…
The Opus is a very good charger. If I would not have my MC3000, it would still be my first choice. I have not the LiitoKala so I cannot give comments about it.
*Sorry for my english. French is my native language.
I said the cells in my previous five photos that they were all fully-charged before they were discharged using the ‘Discharge’ mode (not the Test mode) of my Opus v2.1 and v2.2
The photos were taken after the ’0’ma showed in the Display, meaning the discharging has stopped, and also the mah capacity terminal photos.
Those are the results from my Opus chargers.
You said YOUR Opus (and some other guys in Aliexpress(?) are reporting they are getting higher readings than expected, so be it. I’m not arguing with any of you, I am just showing mine.
Unfortunately for have doubted my integrity by suspecting that I have not fully-charged the cells before the discharge sessions to make sure I will get a low reading, and that’s very funny, to say the least!
So enjoy what you have, and I will enjoy what I have…
Why not do a charge test? That will be the only way to prove your point for your charger.
With all the evidences, telling that the Opus measurements are in the specifications of the cells is wrong and if you continue to repeat it again, you will lose all your integrity. Even if you have a super Opus different from others…beer.
Can you guys go to PM instead of confusing newbies and start questioning other members “intergrity”.
I’m sure both are excellent chargers and no doubt there are always “lemon” out there
