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Thread: Test/Review of Charger Opus BT-C3100 V2.1

  1. #91
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by matt2 View Post
    Thanks. Is there a certain % of what mah is good for its rating? I have one showing 300mah after "discharge/test" but rated at 2400mah and quick test shows 1200. So I assume it's probably not even good for a clock, is it? I just have so many old ones and I'm trying to sort them out. I made a battery box, a small cardboard box with holes drilled in it so I can keep my AA's arranged and hopefully sort by health if I can figure out a good system. Do most people recycle? I hate to throw them away but it's a small town, I don't have a clue where to take them.
    That one seems well done . Maybe others can give more guidelines but if mine are at 50% I consider them ready for recycling as it's not worth the cost or time to maintain them as they may miss termination during charging. I use devices to determine capacity maybe more than chargers. If they don't power the device for the time I need I'll try to revive them once and still probably move them to a lower power device. Then they go for recycle next time. I only consider LSD for low drain devices otherwise they need charging too often.

    I hope most people recycle. Radio shack may still have recycle program, local fire stations often do. Ask around as many charities do it also.

  2. #92

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Most Home Depots or lowes has a recycling area for batteries.

  3. #93

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    My BT-C3400 arrived a few days ago, so far I'm liking it.
    But it's my first charger that I paid more then $10 for, so technically I have nothing to compare it to.

  4. #94
    Flashaholic InHisName's Avatar
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    I, too, charge / test all my old junk cells on it. I noticed that there seems to be an inconsistancy in what it does between successive charge / discharge cycles. One time I might discharge 1700 mAH, the next time the same cell discharges 27,567 mAH !! Obviously something has gone wrong with the 3100's methodolgy of calculations. HKJ, can you offer any explanations ? These odd discharge numbers have only occurred with the junkiest cells that I am attempting to categorize. BTW that cell above when in a low lumen flashlight, ran down in about the 90% of the hours I get from new Duraloops. So, that cell can put out up to 1700 mAH in low current demand devices. It's original mAH when I had it new & my C9000 was new, was 1977 mAH. It is a Duraloop that cycled weekly for 2 years, Then maybe 15-20 more in next 3 years. I'm guessing its at about 120 cycles of use, so far.

  5. #95
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by InHisName View Post
    HKJ, can you offer any explanations ?
    I have a guess: The BT-C3100 works with pulses both during charge and discharge, these pulses are in the 2 to 3A range. If the battery is old it might have problems sustaining them and the charge may terminate a charge/discharge to early.
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  6. #96
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Hey - HKJ. There was a question in another charger recommendation thread about the 3100 vs the 3400. I had read in a review on Amazon someone saying that the 3400 was just the 3100 with the v2.1 rebranded as another model number for a particular manufacturer. Do you know anything about that?

  7. #97
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by ShineOnYouCrazyDiamond View Post
    Hey - HKJ. There was a question in another charger recommendation thread about the 3100 vs the 3400. I had read in a review on Amazon someone saying that the 3400 was just the 3100 with the v2.1 rebranded as another model number for a particular manufacturer. Do you know anything about that?
    I have also heard that the 3400 is just a rebrand of the 3100 V2.1 for a specific dealer.
    My website with battery and charger information: lygte-info.
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  8. #98

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    The BT-C3400 is a minimally improved version of the BT-C3100v2.1 and for exclusive sale by the US seller who is an electronics expert and charger maker himself . One can always drop him an email and ask about these minimal differences, yet i for my part finally did lo inconcebible for xmas and gave away my very last Opus unit (it was v1.0) to a dear friend . I had't been using the Opus much for months, glad now to have cleared space in my drawer. I liked it, DC1, but it has been factually replaced by my prototype units of DC2.

    It was clever enough to release the early iterations v1.0 and v2.0 to market already and gather WWW feedback for further product refinement. The v2.1 seems mature and satisfactory enough for its price point (~35$ GB promotion) and hopefully Opus continues with the BT-C3xxx development as planned. The next notable iteration of the Opus charger model will have an external voltage switch and support 3.6V/4.35V chemistries officially so i will be looking into picking up one the 2015 model.

    Fact is, it easily takes 2+ yrs to develop an advanced battery charger to full maturity status. Fans of DC1, DC2 and USC really need some patience including myself

  9. #99

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    ehehee, they will sell the same charger but with "official" capability to charge 3,6 and 4,35v batteries....... imho just marketing.

  10. #100

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    I've been using my new BT-C3400 almost non-stop for the pass week, been working fine.

  11. #101

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    We are now in 2015 and I was wondering if this is still the charger to get in the 30-40 dollar range?

  12. #102

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Am I reading correctly that this charger doesn't have a DISCHARGE/CHARGE (one time) function? It requires two steps, first put the batteries to discharge then put them to charge?

    It seems that the Charge/test is the closest but it charges the unit first wasting a cycle.

    I dont know alot about charger but isnt this kind of an important feature of any smart charger to have?

  13. #103
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by hammerjoe View Post
    Am I reading correctly that this charger doesn't have a DISCHARGE/CHARGE (one time) function? It requires two steps, first put the batteries to discharge then put them to charge?

    It seems that the Charge/test is the closest but it charges the unit first wasting a cycle.

    I dont know alot about charger but isnt this kind of an important feature of any smart charger to have?
    Much like the LaCrosse chargers that discharge and then charge up in one step, we generally don't like that feature because unless we're standing right over the charger and have the ability to memorize 16 digits in sequence, we miss that number.

    We want to be able to know the capacity of a given battery upon discharge.

    Having a single step allows us to 'know' those numbers, regardless of whether we're off doing other things.

    Chris
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  14. #104

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by ChrisGarrett View Post
    Much like the LaCrosse chargers that discharge and then charge up in one step, we generally don't like that feature because unless we're standing right over the charger and have the ability to memorize 16 digits in sequence, we miss that number.

    We want to be able to know the capacity of a given battery upon discharge.

    Having a single step allows us to 'know' those numbers, regardless of whether we're off doing other things.

    Chris
    I apologise but you confused me with your post.
    Doesnt the capacity show after the battery is charged and not after discharging?
    I usually put the batteries after using them in my lacrosse and use the discharge feature which discharges the rest of the battery and charges it right after.

    Is this wrong/not necessary?

  15. #105
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by hammerjoe View Post
    I apologise but you confused me with your post.
    Doesnt the capacity show after the battery is charged and not after discharging?
    I usually put the batteries after using them in my lacrosse and use the discharge feature which discharges the rest of the battery and charges it right after.

    Is this wrong/not necessary?
    The way you test capacity on any given battery/cell, is to charge it up fully and then discharge it at X, Y or Z current. Generally, the higher the discharge current, the lower the capacity will be for equal batteries/cells, both charged up to full.

    The fact that a charger immediately goes into 'charge' mode after 'discharge,' makes it problematic to know what exactly was there in the tank, unless you get lucky.

    Chris
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  16. #106

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    I understand what you are saying now.
    The Bc9009 doesnt have that function to charge a battery and they discharge it afterwards afaik.

    It has a discharge and then charge feature which I use alot and that is missing with the Opus unless I want it to do it three times with the discharge refresh function.

  17. #107
    Unenlightened danielrhall's Avatar
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by hammerjoe View Post
    It has a discharge and then charge feature which I use alot and that is missing with the Opus unless I want it to do it three times with the discharge refresh function.
    To determine the capacity of a cell, it has to be discharged completely from a full charge. That's what the Test function on the Opus BT-C3100 does; charge fully first, discharge fully, and then charge fully again. The capacity that is then read out is the discharge capacity. The final charge cycle isn't actually needed to determine the discharge capacity but the initial one is. The Maha MH-C9000 calls this function Refresh and Analyze Mode.

  18. #108

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    How do we recondition a cell with this charger?
    Why limit the cycle of the Discharge/Charge to only three? Does that guarantee the maximum recondition of a cell with no more need for extra cycles?

  19. #109
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Received the BT-C3400 today and initial impressions are favorable. It has 2.1 firmware. I was able to charge 4 18650 at 1000mA, (primary reason for the purchase). The fan does make some noise when it runs but where I use the charger the noise should not be a problem, It is in the same room as my computer and I generally have a TV on so I really didn't notice it, unless I was actually trying to hear the fan. I don't think this is a charger for a bedroom as the noise would be noticeable in a very quiet room.

    This replaces a Nitecore D4 which is not a bad charger if you don't mind slow charging, It will only charge 4 18650 at 375mA or 2 at 750mA. I also considered buying a XTAR VP4, but it will only charge 2 18650 at 1000mA or 4 at 500mA , Do not understand why XTAR does not make a real 4 cell version of the VP2.

    The BT-C3100 2.1 and the BT-C3400 appear to be the same charger. And from what I could find are just about the only 2 currently available for less then $50 that will charge 4 18650 (or others) at 1000mA.

    The only minor annoyance I have (personal preference) and it applies to all Opus chargers is the backlight, I would prefer an option to turn the backlight on and off and not have it go off after so many seconds as it does now.

  20. #110
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by curlysir View Post
    Received the BT-C3400 today and initial impressions are favorable. It has 2.1 firmware. I was able to charge 4 18650 at 1000mA, (primary reason for the purchase). The fan does make some noise when it runs but where I use the charger the noise should not be a problem, It is in the same room as my computer and I generally have a TV on so I really didn't notice it, unless I was actually trying to hear the fan. I don't think this is a charger for a bedroom as the noise would be noticeable in a very quiet room.

    This replaces a Nitecore D4 which is not a bad charger if you don't mind slow charging, It will only charge 4 18650 at 375mA or 2 at 750mA. I also considered buying a XTAR VP4, but it will only charge 2 18650 at 1000mA or 4 at 500mA , Do not understand why XTAR does not make a real 4 cell version of the VP2.

    The BT-C3100 2.1 and the BT-C3400 appear to be the same charger. And from what I could find are just about the only 2 currently available for less then $50 that will charge 4 18650 (or others) at 1000mA.

    The only minor annoyance I have (personal preference) and it applies to all Opus chargers is the backlight, I would prefer an option to turn the backlight on and off and not have it go off after so many seconds as it does now.
    Why not just get two VP-2's? That's my plan when I get a light that uses 3-4 x 18650. I just grabbed one to start with to try it but, will order another when needed(I really like it so far). Having 2 separate chargers gives redundancy too. That way if one fails you still have the other to keep you going while you wait for repair/replacement.
    Last edited by Tachead; 01-21-2015 at 11:17 AM.

  21. #111
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by Tachead View Post
    Why not just get two VP-2's? That's my plan when I get a light that uses 3-4 x 18650. I just grabbed one to start with to try it but, will order another when needed(I really like it so far). Having 2 separate chargers gives redundancy too. That way if one fails you still have the other to keep you going while you wait for repair/replacement.
    Already have two VP-2's. But thanks to this site I sometimes have the need to charge more then 4 batteries at a time. I bought the Nitecore D4 first and then purchased the VP-2's during the sales. After buying several 18650 powered flashlights, some using 4 batteries, I noticed the D4 was taking longer to charge then the VP-2 and realized the limitation of the D4. Started looking for a replacement for the D4 that would also charge NiMH and this lead to the C3100 and C3400. If XTAR every comes out with a true 4 cell version of the VP-2 I will probably get it too.

  22. #112
    Flashaholic* tobrien's Avatar
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    has anyone heard about a v3.0 or something yet? I saw there's the "3400" but that's not anything really different it seems
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  23. #113

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Thanks for a thoroughly in depth review. Got one on order based on your information. The test ability alone is a great help as I am putting together some 18650 packs and can match cells.

  24. #114

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    i shoot a picture of the internal switch. now it's easier to me to change it....

  25. #115
    Flashaholic* tobrien's Avatar
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by realista View Post
    i shoot a picture of the internal switch. now it's easier to me to change it....
    nice work!!
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  26. #116

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    How accurate are the discharge and charge capacities displayed by the charger?

    I am wondering how people are determining the real capacity of their cells.
    Do a full discharge and then charge and look at the capacity displayed by the display?
    Do a full charge and then discharge and look at the discharge capacity on the display?

    Or do the one of the above but calculate how long it took and multiply the time by the charge/discharge current?

  27. #117

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by hammerjoe View Post
    How accurate are the discharge and charge capacities displayed by the charger?

    I am wondering how people are determining the real capacity of their cells.
    Do a full discharge and then charge and look at the capacity displayed by the display?
    Do a full charge and then discharge and look at the discharge capacity on the display?

    Or do the one of the above but calculate how long it took and multiply the time by the charge/discharge current?
    I have this charger. I have tested its discharge capacity readings on the same cell, a Panasonic 2900mah NCR-PF cell, fully discharged first, then fully charged by my Xtar VP2, both occasions @ 1A, and the difference in discharge readings between this charger and my hobby charger, the iCharger 106B+, was 8 mah.

  28. #118

    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Where are the heating sensors located? I dont see them in any pictures of this charger.

  29. #119
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Ok, so this one clearly has the internal switch.

    Has anybody yet tested the 3.7V or 4.35V positions?

    BTW, what is the difference between 4.2V and 4.35V?

  30. #120
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    Default Re: Test/Review of Charger Opus BT-C3100 V2.1

    Quote Originally Posted by yorab View Post
    Has anybody yet tested the 3.7V or 4.35V positions?
    Some people has been using it.

    Quote Originally Posted by yorab View Post
    BTW, what is the difference between 4.2V and 4.35V?
    0.15V LG has some cells that need a 4.35V when charging to get maximum capacity.
    My website with battery and charger information: lygte-info.
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    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

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