Opus BT-C3100 vs LiitoKala Lii-500

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IamMatt
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Opus BT-C3100 vs LiitoKala Lii-500

I think I have narrowed my choice down to these two chargers and I hope I can get some feedback. I want a 4-bay charger that is able to charge, discharge, and analyze NiMH and LiIon in a variety of sizes, including reporting the capacity (mAh ) in the cell. I rely heavily on HKJ’s reviews. These two chargers look like they meet my needs and are pretty similar. The main weak points of each that I see are:

1) The Opus uses pulse charging (HKJ would prefer it didn’t) and that the LiitoKala slightly undercharges NiMHs.

2) The LiitoKala takes much longer to do a discharge/charge if I want to know the mAH capacity of a cell—like 10 hrs vs 4 hrs for 18650 and 6 hrs vs 3 hrs for AA NiMH.

The only other main difference I can see is that the Opus has an individual display for each bay so you have to toggle to get all the information for that bay, while the LiitoKala has one large display that shows all the information for a bay at once, but you have to toggle between bays.

Stuff that is less important to me is being able to use the LiitoKala as a power block and including a car adapter, but all else being equal, those would seem to be a plus.

Am I missing any other significant differences between them? And of the ones I mentioned, do any seem important enough to decide on one or the other, or are they so close that it is really only a matter of personal preference?

Thanks.

Why do I carry a flashlight?  Because half of every day is dark.

will34
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The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

tatasal
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will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

gyzmo2002
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tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

tatasal
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gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

gyzmo2002
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tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

The Opus charges to 4.22v(DMM) and discharge to 2.80v. All the test I did with all my brand new cells (B, GA, LG HG2, LG MJ1, Eneloop Pro, etc) results with a higher capacity than the cells rating. A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah.

You probably have a superspecial unit but I don’t think so. All the results I saw when I gave feedbacks on Aliexpress are around the same as mine. You have the MC3000. Take the datasheets of the cell and settle your MC3000 according to them. You will have your answer. If your results are the same with your Opus, your charger is really special.

Edit: If your results are the same with the MC3000, I will give you my mail and you could send me the photos. If you do not want to try your MC3000, do a charge test(C>D>C) with your Opus and send me a picture of your screen with the cells on your charger.

tatasal
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gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah. If your results are the same with your Opus, your charger is really special.

Yes, your memory is correct that the NCR3400B (which I also have and tested several times) has around 3350mah of capacity, that’s the usual ballpark figure I get too in my Opuses and iCharger when discharged to 2.8v.

Perhaps you just have a bad Opus!

gyzmo2002
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tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah. If your results are the same with your Opus, your charger is really special.

Yes, your memory is correct that the NCR3400B has around 3350mah of capacity, that’s the usual ballpark figure I get too in my Opuses and iCharger when discharged to 2.8v.

Perhaps you just have a bad Opus!

I just check the ncr18650B capacity: min 3250-3350mah at 25celsius.

Lol…read my edit ….If you could prove me that your Opus BT3100 doesn’t read high, I will say in this thread that you were right.

You say that you have 3350mah when you discharge at 2.80v. The cells spec says that you have 3350mah max(I give you a chance) from 4.20 to 2.50…. just with that, you see that it is not accurate. Where is the capacity between 2.80 and 2.50? To be fair with you, there is not a lot but there is a little, around 50-100mah probably… I will check it later. We will go with 50mah…+3350 you have…3400. Your higher at this state.

If I do the test with the MC3000 from 4.22-2.80 like the opus, the results are between 3125-3200mah with brand new B cells. With the Opus with the same cells, 3540-3610mah.

Mc3000 from 4.20-2.50 with a 10 cycle B that I removed the pcb, 3252mah and 3502 with the Opus. Don’t forget the cell capacity should be between 3250-3350mah according to the specs.

tatasal
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gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah. If your results are the same with your Opus, your charger is really special.

Yes, your memory is correct that the NCR3400B has around 3350mah of capacity, that’s the usual ballpark figure I get too in my Opuses and iCharger when discharged to 2.8v.

Perhaps you just have a bad Opus!

Lol…read my edit ….If you could prove me that your Opus BT3100 doesn’t read high, I will say in this thread that you were right.

I will look for my cell today (if time permits) and do some tests and show the screen pics. No problem with that.

gyzmo2002
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tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I will wait them patiently.
I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah. If your results are the same with your Opus, your charger is really special.

Yes, your memory is correct that the NCR3400B has around 3350mah of capacity, that’s the usual ballpark figure I get too in my Opuses and iCharger when discharged to 2.8v.

Perhaps you just have a bad Opus!

Lol…read my edit ….If you could prove me that your Opus BT3100 doesn’t read high, I will say in this thread that you were right.

I will look for my cell today (if time permits) and do some tests and show the screen pics. No problem with that.

I will wait them patiently.

gyzmo2002
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Is it normal that the quote are not displayed correctly? Just 1 or 2 words by line…so long.

JPLight
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Quoting too often leads to this pyramiding effect.

bella-headlight
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From HKJ“s review:
OPUS BT-3100 v2:

Testing with 2500 volt succeeded, but 5000 volt between mains and low volt side on the power supply failed. This means this power supply is only safe for 110VAC, not for 230VAC (This is the US supply, the EU supply passed the 5000V test in the first review).
Conclusion
The charger has been improved with the updated software, but many of the problematic areas are stil present:
The user interface is fairly easy to use, but it may take a some time to learn what the different modes does.
The high current peak from the power supply is not good for the power supply and makes the charger show wrong readings.
Generally the peak charge and discharge current for LiIon are a bit high, especially on the outer slots.
The resistance measurement has limited use, not only due to contact resistance, with NiMH the precision is generally low.
I would have preferred constant current, instead of the pulsing.
The NiMH termination has changed, but it is a bit slow to terminate now (It does definitely fill the cells).
LiIon charging now works on all slots. The NiMH charging is probably not as good as in the first version, because the -dv/dt is rather slow to terminate
The analyzing function makes the charger very useful for anybody that wants to know something about the state of their LiIon cell.

The charger is not perfect, far from it, but as long as the problematic areas are know, the charger is a very useful tool

Liitokala Engineer Lii-500:
Testing the EU mains transformer with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.
Conclusion
I like the user interface, put a couple of batteries in and select mode/current with the respective buttons. As long as the number keys are not touched the selection is for all slots (Showing all slot numbers would have been nice).
The charger is very good at charging LiIon, but stops a bit early on NiMH.
The fast test works fine on LiIon, but with NiMH it shows too much capacity (the full test looks more correct).
As usual I am not impressed with the resistance function.
The usb output has very low noise, but need multiple cells to work well with 1A load.

The final result must be that it is a good charger with a useful analyze function.

I have both & prefer the Liitokala UI & I think it charges a little faster when charging 4 × 18650 cells than The Opus, although that could just be me. (the Liitokala is also a bit cheaper in the UK than the Opus)

Ian

gyzmo2002
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JPLight wrote:
Quoting too often leads to this pyramiding effect.
Thank you. I'm not familiar with this forum. Only the last quoted should be displayed. Not all.... It is weird on my iPhone 6+, a lot of scrolling.

Next time, I will try to erase some of them.

gyzmo2002
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Opus BT 3100 v2.2

Although it gives a higher capacity measurement, this is a great charger. I like more my Opus than my Nitecore D4. If I would not have the MC3000, it would still be my daily charger.

For the Liitokala, I don’t have it so I cannot give my opinion.

bella-headlight
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I also have a Nitecore D4 as well as the Opus & Liitokala.
The D4 is fine as a basic charger, just a little slow when charging multiple cells which is not a problem really.
Of the 3 chargers the Liitokala is my favourite.

Ian

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@gyzmo2002

In my post above wherein I quoted a 2.5v cut-out voltage, it was done with the iCharger, not the Opus, and the cell used was a Panasonic NCR18650PF. as shown in the link.

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With Opus you can charge up to 4.35V (but you have to open it to get to the switch). You have the refresh program for NiMh batteries, you can charge up to 2000mAh on bay 1 and 4 with only two batteries. On the negative side, you have the noisy fan.
So I have two Opus BT C3100 V2.2 and two Lii 500 chargers. If I need to test or charge in the night, I use Lii 500, on the day Opus.

Kenneth Myhre

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go for the Opus, its voltage are spot on, on my 2 DMMs my Liitokala 500 overcharges to 4.22V

and since this question has been asked many times, (it was something i wondered myself for a long time, until I bought both), i will paste here what I already written on 12/21/2015 – 07:24 in the Lii500 review topic http://budgetlightforum.com/comment/866907#comment-866907

TheBo wrote:
sjlouis wrote:
And you can explain why?

3100 has a far better explained manual, i normally don’t read manuals but in this case the Lii500 is by far more confused and usually contradictory sometimes in a line it says it detects capacity while charging sometimes it says in the following line it does discharging.
In the manual NOR test and QUICK test are explained as the same test, and usually lines are copy/paste even if they shouldn’t. Also never head of a charger having fever Silly
the 3100 manual it’s far more consistent and understendable even if there are some english errors.

Anyway, forgiving the manual

3100 has thermal sensors (clearly stated in the manual) and even the fan actuating temperature is described 40°C IIRC( more precise data is a plus for me, meaning they actually have numbers and have really thought about it while projecting)
3100 has a self restarting charging if VOltage drops
Lii500 has no clear discharging function
3100 always display mAh even live while charging/discharging

3100 IR test sadly has to be made manually while Lii500 has them automatically made upon 3sec of inserting the batery (but lii500 value are not stantdart Ohm values)
3100 has a fan which could be annoying if you charging in your room like me while watching tv, anyway i like it has it gives me a more safe feeling about temps
3100 has no Powerbank, even if i will not using it certainly having it is a plus, undoubtely
3100 has a more precise Voltmeter in my opinion and chargin is always Spot on I always found batteries at about 4.17-4.19V even after 30min pulled out of the charger
3100 has live ammeter (precise or not) if you set lets say 1000mA current you can see the current be 997mA or 1002 mA …just saying, also on termination you can see the current decresing lively…. 111mA, 99ma….etc… 22mA …..on lii500 there’s just a still symbol for the selected current
3100 can go down to 200mA in chargin current (yeah, pulsating Sad ) while lii has 300mA
3100 can go up to 2× 2A charging , lii500 can just do 4×1A
DIscharging currents are max 500mA x4 in lii500 while 3100 can do 2000mA x2. 3100 gives you a more wide selection of current in every situation
the 3100 UI is worse esthetically but far more easy to use IMHO

also being more manual in its charging/discharging phases I like it more….as it will give you more control, let’s say you just want to see the discharged capacity, the lii 500 has to go through one of those cycling tests

This list could contain errors as I’ve not tested in parallel trying to do the same thing at the same moment but so far it is what i remeber feel free to correct me

Rufusbduck wrote:
Getting discouraged is normal but doesn't finish the job.
Mike C
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QUOTE: 1) The Opus uses pulse charging (HKJ would prefer it didn’t) and that the LiitoKala slightly undercharges NiMHs.” (quoting like this as quote button on OP is missing since site upgrade).

I saw a link posted some time ago (by tatasal maybe?) about tests showing that pulse charging is not an issue. I couldn’t find the link though. Has this changed?

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“go for the Opus, its voltage are spot on, on my 2 DMMs my Liitokala 500 overcharges to 4.22V”.
Accepted charging voltage for 4.2v cells is +/- .05v so 4.22v is absolutely fine.
Immediately off the Lii 500 my DMM (Amprobe) shows cells at 4.19v.
“3100 has a more precise Voltmeter in my opinion and chargin is always Spot on I always found batteries at about 4.17-4.19V even after 30min pulled out of the charger”
Surely for the voltage to be up to 4.19v 30 minutes after charging dosen“t that show that the Opus is also charging over 4.20v ?
Not arguing just curious ?
At the end of the day I have both chargers & they are both fine chargers IMO I just prefer the Liitokala.

Ian

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I own both chargers. OPUS is much “friendlier” for day to day usage.

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freeme wrote:
I own both chargers. OPUS is much “friendlier” for day to day usage.

Curious in what way ?
If you mean friendlier to the cells then the D4 is even friendlier as it only charges to about 4.18v in my experience.

Ian

gyzmo2002
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tatasal wrote:
@gyzmo2002

In my post above wherein I quoted a 2.5v cut-out voltage, it was done with the iCharger, not the Opus, and the cell used was a Panasonic NCR18650PF. as shown in the link.

I demonstrated that Opus provides a higher measure regarding the capacity because you affirmed the opposite in your first post and this is not the first time. All I ask you is not to make this statement anymore because it is false and this will induce member wrong.

If you need some help with the MC3000, you have my mail. An advice, don’t bother you with the dummy mode, go straight in advanced mode and you will learn a lot about parameters to charge batteries.

tatasal
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gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah. If your results are the same with your Opus, your charger is really special.

Yes, your memory is correct that the NCR3400B has around 3350mah of capacity, that’s the usual ballpark figure I get too in my Opuses and iCharger when discharged to 2.8v.

Perhaps you just have a bad Opus!

I just check the ncr18650B capacity: min 3250-3350mah at 25celsius.

Lol…read my edit ….If you could prove me that your Opus BT3100 doesn’t read high, I will say in this thread that you were right.

You say that you have 3350mah when you discharge at 2.80v. The cells spec says that you have 3350mah max(I give you a chance) from 4.20 to 2.50…. just with that, you see that it is not accurate. Where is the capacity between 2.80 and 2.50? To be fair with you, there is not a lot but there is a little, around 50-100mah probably… I will check it later. We will go with 50mah…+3350 you have…3400. Your higher at this state.

If I do the test with the MC3000 from 4.22-2.80 like the opus, the results are between 3125-3200mah with brand new B cells. With the Opus with the same cells, 3540-3610mah.

Mc3000 from 4.20-2.50 with a 10 cycle B that I removed the pcb, 3252mah and 3502 with the Opus. Don’t forget the cell capacity should be between 3250-3350mah according to the specs.

Here are the results of Discharge Capacities of my Opus BT-C3100 v2.1 and v2.2:
Cells used: Brand-new Samsung 30Q flat-top, brand-new Sanyo UR14500P 840mah and a slightly-used Panasonic NCR18650B 3400mah
Charger used to charge the Sanyo 14500 is the Opus itself.
18650 cells were charge at 1A, 14500 was charge at 700ma. Straight discharge mode was used in the two Opus chargers.

The photos below will show that the Opus does not read high as you believe it does, and is just as accurate as the MC3000, discharge-capacity wise:
The O ma pic just shows that discharging has stopped:
! photo IMG_0527_zpsa5sa2t0u.jpg!

You said you got 3252mah on your MC3000, well I got 3254mah from my Opus v2.2 (not bad at 2mah difference huh)

! photo IMG_0526_zpsgkcwtnfk.jpg!

! photo IMG_0529_zpsdchy9nw0.jpg!

! photo IMG_0528_zpsgidz33rk.jpg!

! photo IMG_0524_zps8h0v5ju1.jpg!

I can’t seem to straighten up the pics, can somebody please do it for me? Thanks

gyzmo2002
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tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
gyzmo2002 wrote:
tatasal wrote:
will34 wrote:
The opus is a very capable charger, but both of my units had faults, it also reads higher capacity than actual. Haven’t tried the lii500 yet as I upgraded to the MC3000 instead and am very happy with it.

Well, I have/had 2 Opus 2.0, also 2 Opus 2.1 and the 2.2 versions. Somewhere in BLF I have posted a result of my 2.1 having a discharge capacity difference of only 8 mah compared to the result I got from iCharger 106B+ hobby charger. In all my tests with the Panasonic NCR18650PF/PD cells I run it through with, there was not much difference among them the Opuses AND the iCharger (and in every discharge session made, the test cell was charged by my Xtar VP2, btw).

I also have the MC3000 but have not tested it yet because of my disappointment of it not friendly to flat-top cells (and I don’t want to use magnets), I still have not tried it yet until now.

As to your observation that Opus reads a higher capacity, well, it’s either all my Opuses and iCharger (which is highly unlikely to my mind) all read too high or the MC3000 reads too low.

The Opus read a higher capacity than the cells rating. The MC3000 is target. I did the test on CPF.

I never had my any of Opus read higher than the cell’s capacity. I only did get one reading higher than the cell’s rated capacity in my iCharger when I set the discharge cut-off down to 2.5volts.

http://budgetlightforum.com/node/29051 (cells were discharged at 1, 3 and 5 amps down to 2.5v)

A18650B 3400mah has a max capacity of 3350 if my memory is correct. All my results were around 3500mah. If your results are the same with your Opus, your charger is really special.

Yes, your memory is correct that the NCR3400B has around 3350mah of capacity, that’s the usual ballpark figure I get too in my Opuses and iCharger when discharged to 2.8v.

Perhaps you just have a bad Opus!

I just check the ncr18650B capacity: min 3250-3350mah at 25celsius.

Lol…read my edit ….If you could prove me that your Opus BT3100 doesn’t read high, I will say in this thread that you were right.

You say that you have 3350mah when you discharge at 2.80v. The cells spec says that you have 3350mah max(I give you a chance) from 4.20 to 2.50…. just with that, you see that it is not accurate. Where is the capacity between 2.80 and 2.50? To be fair with you, there is not a lot but there is a little, around 50-100mah probably… I will check it later. We will go with 50mah…+3350 you have…3400. Your higher at this state.

If I do the test with the MC3000 from 4.22-2.80 like the opus, the results are between 3125-3200mah with brand new B cells. With the Opus with the same cells, 3540-3610mah.

Mc3000 from 4.20-2.50 with a 10 cycle B that I removed the pcb, 3252mah and 3502 with the Opus. Don’t forget the cell capacity should be between 3250-3350mah according to the specs.

Here are the results of Discharge Capacities of my Opus BT-C3100 v2.1 and v2.2:
Cells used: Brand-new Samsung 30Q flat-top, brand-new Sanyo UR14500P 840mah and a slightly-used Panasonic NCR18650B 3400mah
Charger used to charge the Sanyo 14500 is the Opus itself.
18650 cells were charge at 1A, 14500 was charge at 700ma. Straight discharge mode was used in the two Opus chargers.

The photos below will show that the Opus does not read high as you believe it does, and is just as accurate as the MC3000, discharge-capacity wise:
The O ma pic just shows that discharging has stopped:
! photo IMG_0527_zpsa5sa2t0u.jpg!

You said you got 3252mah on your MC3000, well I got 3254mah from my Opus v2.2 (not bad at 2mah difference huh)

! photo IMG_0526_zpsgkcwtnfk.jpg!

! photo IMG_0529_zpsdchy9nw0.jpg!

! photo IMG_0528_zpsgidz33rk.jpg!

! photo IMG_0524_zps8h0v5ju1.jpg!

Do a charge test. Nothing prove me with your test that your battery was full at the beginning. I could take one at 4.10 and do a discharge to have an accurate result as the one you are. On a charge test, the charger will charge to full, discharge to 2.80 and charge again.

Edit: At the end, I need to see charge test on your display.

tatasal
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@gyzmo2002

I have nothing to gain if I purposely ‘undercharge’ as you maliciously suspect it to be. The cells were charged full, I’ll be crazy not to and just ‘approximate’ it to get the discharge capacities?

It’s now just past midnight..goodnight!

gyzmo2002
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Location: Montreal, Canada

tatasal wrote:
@gyzmo2002

I have nothing to gain if I purposely ‘undercharge’ as you maliciously suspect it to be. The cells were charged full, I’ll be crazy not to and just ‘approximate’ it to get the discharge capacities?

It’s now just past midnight..goodnight!

It is the only way for me to see that your batterie were full at the beginning.

Goodnight, we are 11:50am in Montreal.

gyzmo2002
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Location: Montreal, Canada

@Tatassal

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.

tatasal
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gyzmo2002 wrote:
@Tatassal

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.

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.

will34
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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.

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