Need A Replacement Charger for Opus BT-C3100

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Yourrid
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Need A Replacement Charger for Opus BT-C3100

Hey guys, I’m in the market for a new charger. My Opus BT-C3100 v1 is having fan issues (sounds like a car revving), and one of the spring loaded negative battery contacts broke off. I’ve had this charger for ~3 years and I feel like its time for a new one; and keep this one as a backup. I definitely need something with 4 or more ports, and has at least 2 of the ports able to charge a 2amps.

I’m debating between:

  • Opus BT-C3400 (Looks like the same thing as my old one)
  • Efest LUC V4 (Looks great but doesn’t have the discharge modes like the Opus does)
  • XTAR VP4 Plus Dragon Charger (Has all the features of the Opus, for $20 more)

Any other recommendations? I definitely want a charger packed with features.

Thanks guy!

wolfdog1226
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I have the LUC 4 and I am actually storing it because of my 3 x Fenix ARE-C2[Using Two] that I like better and my recently purchased Opus BT-C3100 2.2.

I have 4 chargers on my table. 2 Fenix/ Opus 2.2 and KP L2 for my smaller cells and when I only need 1 or 2 charged!

I looked at the dragon b/4 I got the opus. The price was definitely a factor and iirc you can only see 2 slots at once on the LCD screen. I prefer seing what ALL bays are doing at once! There was a few other things i was not fond of but can not remember!

I would go with the Opus 2.2 version. From what I heard the fan noise was reduced from the earlier models. Mine does not make much noise at all.

Good luck w/ your choice

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tatasal
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IIRC the Xtar Dragon is not a fully-independent 4-bay charger, of which the Opus is.

Zebretta
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Beats me. Even the top of the line MC3K can’t charge 2 ports at 2A….2Amps total….but not on 2 ports at the same time. That charger you’re looking for better have one helluva good cooling setup.

I have two 4 port chargers. AccuPower IQ338XL and MC3K…but neither will do that.

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Zebretta wrote:
Beats me. Even the top of the line MC3K can’t charge 2 ports at 2A….2Amps total….but not on 2 ports at the same time. That charger you’re looking for better have one helluva good cooling setup.

I have two 4 port chargers. AccuPower IQ338XL and MC3K…but neither will do that.

The Opus has a fan,,,mine NEVER gets hot.

My Fenix does[gets hot] but I have a slab of steel to rest it on that acts as a heat sink! Works remarkably well and does not get hot anymore!

My LUC V4 can charge 2 × 2amp and that never gets hot and it does not have a fan.

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Environment molds a person. Perseverance changes them. 

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I have a Xtar SV2 Rocket… 2 × 2A & it does not get hot either. It has no fan.

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Yourrid
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tatasal wrote:
IIRC the Xtar Dragon is not a fully-independent 4-bay charger, of which the Opus is.

If this is true, then there’s no point in even looking at that one. I’m beginning to realize that I’ve been spoiled by all the features on the Opus.

And as far as the heat, I’ve never had an issue with the Opus. I’ve got plenty of batteries lying around so I rarely charge a 18650 higher than 1amp and 26650’s usually at 2. Never had a heat issue.

I do on occasion charge a AA, 18350, discharging a 18650 and charging a 26650. So independent slots is a tough feature to give up.

RollerBoySE
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It is not perfect, but unless you wanna splurge on a SkyRC MC3000, the Opus bt-c3100 is still probably the best choice in that price range.

tatasal
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Yourrid wrote:
tatasal wrote:
IIRC the Xtar Dragon is not a fully-independent 4-bay charger, of which the Opus is.

If this is true, then there’s no point in even looking at that one. I’m beginning to realize that I’ve been spoiled by all the features on the Opus.

I do on occasion charge a AA, 18350, discharging a 18650 and charging a 26650. So independent slots is a tough feature to give up.

Oh yes, the Opus’ feature of having fully-independent slots of 4 is so versatile that it can get you spoiled, as I seldom use the same mode on all 4 bays at once, but almost always a combination of modes.

On the other hand, someone in CPF reported his MC3000 goes up to 70C or 158F discharging 4×18650 @ .7a I believe…and he put a laptop bottom fan just to bring down the temperature to 60C! For me that’s poor thermal management and can be scary if something goes wrong with the fan but goes unnoticed.

Pöbel
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If something with the fan goes wrong it will get noticed though, as the mc3000 has thermal monitoring for system & batteries.

tatasal
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Pöbel wrote:
If something with the fan goes wrong it will get noticed though, as the mc3000 has thermal monitoring for system & batteries.

Though I believe something that costs this much should have been re-designed after thermal issues have been reported for quite a while already, yet….it’s just too hot for my taste.

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The fact that HKJ uses he MC3000 himself is a strong indication of it being a good choice.

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tatasal wrote:
Pöbel wrote:
If something with the fan goes wrong it will get noticed though, as the mc3000 has thermal monitoring for system & batteries.

Though I believe something that costs this much should have been re-designed after thermal issues have been reported for quite a while already, yet….it’s just too hot for my taste.

I have not seen any thermal issues with the MC3000 and it is very unlikely that any will happen. It has sensors that will reduce power long before it gets too hot.
That the sensors works was shown in the first batch where the fan was pulling air down past the heatsink, that could not always remove all the heat from a 4 cell LiIon discharge and the charger would reduce the discharge current to avoid any issues. In later the models the fan has been turned around and blows air up over the heatsink, this improves the airflow slightly and the charger can usual discharge at full current (This will depend on the ambient temperature).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

tempo
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I am recommending the liitokala lii500 for you since you’re on a budget

tatasal
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HKJ wrote:
. That the sensors works was shown in the first batch where the fan was pulling air down past the heatsink, that could not always remove all the heat from a 4 cell LiIon discharge and the charger would reduce the discharge current to avoid any issues. In later the models the fan has been turned around and blows air up over the heatsink, this improves the airflow slightly and the charger can usual discharge at full current (This will depend on the ambient temperature).

Oh well, issues like this would now have been avoided if “due diligence” (for a charger/analyzer costing that much) have been done right from the start, and even then, with the current model, I don’t have a problem with my Opus even with an ambient temperature reaching 38C in my country, easily discharging 4 × 18650 @ 1A each, even from the time of the 2.0 version.

Technical superiority should have been coupled with excellent functionality.

Happy are those who have the latest versions, but for the rest of us, I rest my case. Facepalm

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tatasal wrote:
HKJ wrote:
. That the sensors works was shown in the first batch where the fan was pulling air down past the heatsink, that could not always remove all the heat from a 4 cell LiIon discharge and the charger would reduce the discharge current to avoid any issues. In later the models the fan has been turned around and blows air up over the heatsink, this improves the airflow slightly and the charger can usual discharge at full current (This will depend on the ambient temperature).

Oh well, issues like this would now have been avoided if “due diligence” (for a charger/analyzer costing that much) have been done right from the start, and even then, with the current model, I don’t have a problem with my Opus even with an ambient temperature reaching 38C in my country, easily discharging 4 × 18650 @ 1A each, even from the time of the 2.0 version.

Technical excellence should have been coupled with excellent functionality.

Happy are those who have the latest versions, but for the rest of us, I rest my case. Facepalm

Opus do not have a temperature protection and because it gets much hotter it can handle the same power with less cooling.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Zebretta
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Some of the replies say their charger “Never gets hot”……..how do you know? (for those of us who don’t own those chargers)

That’s very subjective. What is “Hot” ?

I’ve seen my MC3K get to 122F (system temperature). Would you consider that as “hot” ?
BTW…my new MC3K was only $79.95 Smile

I wish you guys that generically said “my charger never gets hot” would have posted the max temps you’ve seen with your LUC and OPUS chargers. That might have been more helpful. Or…maybe those chargers don’t tell you the system temp…so you would have no idea? Are we guessing? (maybe they do)

Just sayin

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Zebretta wrote:
That very subjective. What is “Hot” ?

I’ve seen my MC3K get to 122F (system temperature). Would you consider that as “hot” ?
BTW…my new MC3K was only $79.95 Smile

I believe the System temp. is the heatsink temp and 122F/50C is fairly cool for a heatsink. As far as I remember the limit is 176F/80C and even that is not hot for a heatsink.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:
Zebretta wrote:
That very subjective. What is “Hot” ?

I’ve seen my MC3K get to 122F (system temperature). Would you consider that as “hot” ?
BTW…my new MC3K was only $79.95 Smile

I believe the System temp. is the heatsink temp and 122F/50C is fairly cool for a heatsink. As far as I remember the limit is 176F/80C and even that is not hot for a heatsink.

Awesome!
Ya know…I like to keep my cool so I use a mini desktop cooling fan just for extra measure. I usually have a system temp of 82F (27.7C) when charging or discharging.

I have to admit, as much as I’m not happy with their warranty process, I really like the MC3K and at the price I paid it was an easy decision.
This thing is so far above all the others it’s in a whole different class.

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RollerBoySE wrote:
The fact that HKJ uses he MC3000 himself is a strong indication of it being a good choice.

+1

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gauss163 wrote:
RollerBoySE wrote:
The fact that HKJ uses he MC3000 himself is a strong indication of it being a good choice.

That’s not a good way to make such decisions. A good charger for one user might be terrible for another, e.g. experts may not mind fiddling with complex programming but novices may require very simple plug-n-play. Some users may use it only in contexts where there is adequate external cooling and in fireproof places and while keeping on eye on it (so they have little worry about overheating) but none of those may be true for other users. Some users may not mind if they have to open it for simple repairs (e.g. to replace a fan or spring pins), but this might be a showstopper for others.

The more complex the product, the more factors that influence suitability, so the less likely that another user will have exactly the same requirements as you. Already analyzing chargers are complex enough that this applies.

Good point, if I remember right he even wrote that it’s not a charger for everyone.
But I don’t think he would be using it if it wasn’t good.

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HKJ wrote:
tatasal wrote:
HKJ wrote:
. That the sensors works was shown in the first batch where the fan was pulling air down past the heatsink, that could not always remove all the heat from a 4 cell LiIon discharge and the charger would reduce the discharge current to avoid any issues. In later the models the fan has been turned around and blows air up over the heatsink, this improves the airflow slightly and the charger can usual discharge at full current (This will depend on the ambient temperature).

Oh well, issues like this would now have been avoided if “due diligence” (for a charger/analyzer costing that much) have been done right from the start, and even then, with the current model, I don’t have a problem with my Opus even with an ambient temperature reaching 38C in my country, easily discharging 4 × 18650 @ 1A each, even from the time of the 2.0 version.

Technical excellence should have been coupled with excellent functionality.

Happy are those who have the latest versions, but for the rest of us, I rest my case. Facepalm

Opus do not have a temperature protection and because it gets much hotter it can handle the same power with less cooling.

Wait the opus doesn’t have tempature protection? When I got my 2.2 the instructions say something about reducing current at one temp And then if it reaches a certain internal tempature the unit shuts off until tempatures drop below a thresehold

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Speed4goal wrote:
Wait the opus doesn’t have tempature protection? When I got my 2.2 the instructions say something about reducing current at one temp And then if it reaches a certain internal tempature the unit shuts off until tempatures drop below a thresehold

Then it probably have and I have just not warmed it enough up to trigger it.
But it do not change that it runs hotter than the MC3000, the 80C temp. limit is fairly low.
Look at this review for electronic that runs hot (Some of it a bit too hot): http://lygte-info.dk/review/USBmeter%20Load%20resistor%20Juwei%202.5-5-1...

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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gauss163 wrote:
RollerBoySE wrote:
The fact that HKJ uses he MC3000 himself is a strong indication of it being a good choice.

That’s not a good way to make such decisions. A good charger for one user might be terrible for another, e.g. experts may not mind fiddling with complex programming but novices may require very simple plug-n-play. Some users may use it only in contexts where there is adequate external cooling and in fireproof places and while keeping on eye on it (so they have little worry about overheating) but none of those may be true for other users. Some users may not mind if they have to open it for simple repairs (e.g. to replace a fan or spring pins), but this might be a showstopper for others.

The more complex the product, the more factors that influence suitability, so the less likely that another user will have exactly the same requirements as you. Already analyzing chargers are complex enough that this applies.

Well….the OP did say he wanted a charger “Packed with features”.

Thanks for all your hard work and reviews HKJ!
I partially based my decision to buy the MC3K on your reviews and reading threads here. BEST decision I’ve made in this hobby.
By reading and learning, from you and others my knowledge has increased a good bit. (still a LONG way to go)
but with all the great info here I’m really enjoying this hobby.

I’m sure the OP will buy whatever charger he feels works best for him. And it will be the correct choice for him no matter which one he chooses.
(At least until his knowledge increases…..as mine did)

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Here is my Heat sink for my Fenix ARE-C2! I am VERY pleasantly surprised in how well it works. My Fenix charger gets hotter than any other I own or have owned.It gets warm at best now!

This is Not rocket science. It is simple, creative and Very effective! I never claimed to be mechanically inclined nor do I excel in the science behind electrical components and how they operate.

This slab of steel is L=6”, W=1.5”,H=1” and weight is 3.3LBS/1.5KG

It almost looks like that “slab of steel” was made for the ARE-C2. It is the same length as you will see in the pics. below!

I have heard that HEAT is the enemy of L.ion cells. I do not doubt that. I will say that my first ARE-C2 is over 3 years old and my Orbtronic 18650 are 4Y 3M old w/ over 430 cycles.75% of those cycles have been charged in my ARE-C2.I have other batteries that have been charged in the ARE-C2 their entire life and are still going.With that said,,,,,,,,,eliminating heat is definitely beneficial for the charger and also the batteries.

I am a simpleton. “It is the “Simple Things in Life” that make me happy!

Solitude breeds contemplation which creates clarity. 

Environment molds a person. Perseverance changes them. 

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Zebretta
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gauss163 wrote:
@Zebretta Why did you quote my post? Your reply has nothing to do with what I wrote. (the post was later edited, but it still has little relationship).

Really? No harm intended there my friend.
Your post just got me thinking of how many times I’ve referred to HKJs’ posts and his website and I really feel he knows his stuff.
You may be right. If so, please accept my apology.
Regards.
Z

PS..
If you’re offended, please tell me how I can change the post to suit you. Smile

Zebretta
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gauss163 wrote:
@Zebretta No problem I wasn’t sure if perhaps you meant to say more but were pulled away, or something similar.

It’s probably more of a getting “old and forgetful” thing Tired