Opus BT-C3100 vs LiitoKala Lii-500

@gyzmo2002 :

The photo below now show the conclusion the NCR-B after the “Charge Test” you are demanding to make sure the cells have undergone the C-D-C for a doubtless full-charge.

Again, the photo below will show that MY Opus chargers (v2.1 and v2.2) DOES NOT read high and is believe common to a large majority of Opus BT-C3100 owners.

!!

@tatasal

I have to do another answer because when I send the one I just did(take me 1 hour with my english) I lost all when sending with my iphone.

I will use my computer and do another one and will edit this one.

Question for the original poster, IamMatt. A single request posted, no other action at all.

Did you get anything useful out of this thread? People like you start threads of this sort all the time and they seem to rapidly deteriorate into discussions that are so arcane as to be of no value to anyone but the arguers.

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.

Show me one thread that I have started here… and on CPF to prove your point.

Your comment is not usefull in this discussion. If you don’t want to read and understant it, you have the choice to past to another. When someone affirm something and you affirm the opposite, we have to prove our point. That is the purpose of a forum to share knowledge and it is in the forums that I learn a lot. I have seen so many people who say anything agains by just to say something.

If the moderator judge the proof of my statement not usefull in this thread, fell free to delete them. One person says black, the other says white. Keep the two versions only if you want. But without argumentation, I don’t think it will be usefull.

BTW, if you have evidence that what I said is wrong, I invite you to show me. In PM if you want.

One possibility: when you know you’re wrong, you do not try to argue otherwise you risk to get caught.

To answer your question, yes, I think I did. Several posters tried to address my specific concerns (thanks, y’all), and I am digesting and researching their responses/opinions and I think I am closer to a decision. Thing is, I like to collect flashlights but I don’t want to collect chargers (lol) so I would rather just buy one (more) that will do what I want.

I am not sure about threads stated by People Like Me (!) deteriorating into arcane discussions; I haven’t seen many threads here that got derailed as much as this one.

If my argument not informed you in your choices, and since you’re the instigator of this thread, you could ask the moderator to delete it. It is technical but I had to demonstrate what I said because we had two differents opinions.

I am trying to decide between these very two analyzing chargers. While I would love to pony up for the new holy grail charger - the MC3000, I simply can not justify the $100 expense. I have salvaged many 18650 batteries from laptops and I would like to be able to see what the capacities are for the ones that pass the initial “> 3.0v resting salvage voltage” pass / fail test. This thread has reinforced my thoughts that I will go with the Lii-500.

  • HKJ prefers non pulse charging
  • Lii-500 has battery bank capability

A plus for me for both of these chargers is that they take a 12VDC input voltage, which means that I can easily power them from a car battery for charging on the go or in the event of a power outage.

As for the rest, I will simply thank tatasal for patiently posting the results of your testing.

@IamMatt: I apologize for derailing this thread.

@gyzmo2002: new Charge Test photos (if these photos still cannot convince you, nothing else will)

Opus BT-C3100 v2.2
Samsung INR18650-30Q brand-new 3000mAh
1A charge/discharge rate
mode used: Charge Test

!!
What’s clearly shown below is that my Opus does not exceed the cell’s rating of 2900mah.
!!

Isn’t the Opus BT-C3100 the unit/model that has the pain in the A$$ fan noise failure issue? if so I would that this deserves to the added to the pro and con list?

And also how to they compare on price? It might be possible to buy two of one type over only one of the other? that might help address charge/capacity runtime issues?

No worries. I appreciate that you both were trying to help me with my question.

Did my Charge Test photos in post # 61 not convinced you yet?

Hi!

This is an old tread but here is my 2 cents.

I also get higher capacity ratings on both my Opus bt-3100 and my Liitokala lii-500. I have a project going to rescue some cells from dead laptop batteries and get some mesurements that are higher than their original capacity. (And almost all are higher than expected)

I use the “test” program on the opus that charges-discharges (and mesure this)-charge to 4,2V again.

The Lii-500 I use the “NOR TEST” that charges-discharges (and mesure this)- end (so it does not charge the battery back up.

Both mesures the discharge from 4,20-2,80V at a discharge of 0,5A.

When I get a cuple of cells that are 3-4 years old from defect laptop battery and have slightly higher (mesured on lii/opus) than original something is a bit off.

I will do more testing (have 4 lii 500, 2 Opus and 2 imax B6) to find the most realistic number. The B6 only discharge from 4,2-3,0V but I think the numbers I get from this is closer to reality.

Do any of you have a good thumb rule of what to take of the test numbers on the chargers to get the most realistic capacity?

Is 100-150mV around the right amount to discount from the capacity testing?

If I do remember correctly, HKJ pointed out that the way the Opus BT-C3100 consumes power (high current bursts) was probably the cause of the inaccuracy of its measurements, due to the fact that its power supply can't cope with these quite high input current demands without its Vin crumbling. Check this graph:

Has anyone tried to feed it with a proper 12V 10+A PSU, in order to see how it fares?

Cheers ^:)

I have an Opus and I’m feeding it 5A. I also have a Li-500 and an Accucell-6 hobby charger. They all give me different results but are probably within 10% of one another. Repeat tests on the same charger is more in the 2-5% difference, sometimes better.

The internal resistance measurement on my Li-500 is useless. On the Opus it’s pretty erratic but seems to at least be in some kind of ballpark.

Looking for a good charger that gives capacity reading and found this thread/argument. This gyzmo2002 dude is an arrogant tool to fight over a battery charger the way he did in this thread. :person_facepalming:

Interesting observation SSV…… :smiley:

Go with the Lii 500…. the OPUS does give “optimistic” discharge capacity readings. I have both & the Lii 500 is my go to charger for capacity measurement.
It is a bit cheaper also. :slight_smile:

Thanks man. Does it take hours to get the measurement, or can you insert and get it in a reasonable amount of time?

The Zanflare C4 should probably be thrown into the decision given the good review by HKJ.