Opus BT-C3100 V2.0 "Dreamcharger" GROUP BUY Now @ $ 36. New coupon code - tatasal -(to close July 15) NOW CLOSED

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Skylined
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Thanks blfdemigod! Smile

Taudris
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I just bought 1 with the US plug.

Alexp
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And I decided to order (EU) 04/30/2014… Confused adapter.Today confirmed EU. Waiting for results.

In many analogues problem (Powerfocus)
http://forum.fonarevka.ru/showthread.php?p=515211#post515211
(Particularly interesting for Henry)

dazed1
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Werner wrote:
Have I overseen something? This charger don’t charges 4 cells with more than 1A properly, but you all want to buy it?

There is no charger which can charge 4x cells (18650) @2A for this price, and even for 20$ more. IMHO this is the best charger one can buy atm for the money, followed by Effest LUC V4.

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

HKJ
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dazed1 wrote:
There is no charger which can charge 4x cells (18650) @2A for this price, and even for 20$ more. IMHO this is the best charger one can buy atm for the money, followed by Effest LUC V4.

Best charger is a very difficult thing to say. 4*Xtar MC1 is a better 18650 charger for the price, it has no pulsing and very good CC/CV curves.

But as analyzing charger the BT-C3100 wins.

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

dazed1
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HKJ wrote:

dazed1 wrote:
There is no charger which can charge 4x cells (18650) @2A for this price, and even for 20$ more. IMHO this is the best charger one can buy atm for the money, followed by Effest LUC V4.

Best charger is a very difficult thing to say. 4*Xtar MC1 is a better 18650 charger for the price, it has no pulsing and very good CC/CV curves.

But as analyzing charger the BT-C3100 wins.

But then you need like 4 different outlets or adapter…..its much more convenient to use single unit imho. Also it doesn’t have 1A per cell which will be much faster. I’m not arguing here, clearly you are the expert, just thinking loud here.

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

HKJ
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dazed1 wrote:
But then you need like 4 different outlets or adapter.....its much more convenient to use single unit imho. Also it doesn't have 1A per cell which will be much faster. I'm not arguing here, clearly you are the expert, just thinking loud here.

My point was that the best charger, depends on what you prioritize. I am not going to use the BT-C3100 for regular LiIon charging, there I will use a charger with non-pulsing CC/CV, but if somebody ask me about a good analyzing charger, it is very likely it will be BT-C3100, especially if the updates works as described.

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

dazed1
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Right now i understand you, what i meant is multi cell charger i should say.

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

blfdemigod
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HKJ wrote:

dazed1 wrote:
But then you need like 4 different outlets or adapter.....its much more convenient to use single unit imho. Also it doesn't have 1A per cell which will be much faster. I'm not arguing here, clearly you are the expert, just thinking loud here.

My point was that the best charger, depends on what you prioritize. I am not going to use the BT-C3100 for regular LiIon charging, there I will use a charger with non-pulsing CC/CV, but if somebody ask me about a good analyzing charger, it is very likely it will be BT-C3100, especially if the updates works as described.

HKJ, after reading this aricle about pulse charging http://2bfly.com/knowledgebase/battery-chargers/charging/ isn't it better for a charger to pulse charge

Pulsed Charging

Pulsed charging does just that; pulses current to the battery in short bursts. Unlike “burping” methods (see above), there is no current reversal (discharge) involved but rather a rest period between charge pulses. These short rest periods allow for the cell chemistry to stay in synchronization with the rate at which the current is being fed. High charge rates can actually apply more current than the battery chemistry can absorb so pulsed charging allows for a stabilization period between pulses that helps minimize the formation of gas bubbles at the electrode and crystal growth (reduced capacity). The rest period between pulses can also allow the charger to sample the no-load voltage of the battery for safety and increased accuracy.


I would think this is why the BT-C3100 was designed this way to give accurate cell info and well as minimize the formation of gas bubbles and crystal growth. I am no expert in the battery field, but wouldn't the BT-C3100 be a good lithium ion battery charger as well as a battery analyzer, especially if the random spikes you have observed from your previous testing have been ironed out in the version 2.0 firmware update?

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HKJ
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blfdemigod wrote:
HKJ, after reading this aricle about pulse charging http://2bfly.com/knowledgebase/battery-chargers/charging/ isn't it better for a charger to pulse charge

For NiMH is might be fine, but I have not seen any description that says it is fine for LiIon.

With puls charging you will have to use a higher current, if you want the same average charge current, this does mean more heat is created.

There is also the question about high current pulses into small batteries, how does it affect them?


blfdemigod wrote:
I am no expert in the battery field, but wouldn't the BT-C3100 be a good lithium ion battery charger as well as a battery analyzer, especially if the random spikes you have observed from your previous testing have been ironed out in the version 2.0 firmware update?

Before I see a document stating that high current charging pulses are ok for small LiIon batteries I will rate constant current chargers as better.

There is also the minor detail about the CC/CV, with a pulsing charger it is simulated, not a real CC/CV, usual the practical difference will be minor.

The above comments does not make this a bad charger, it is probably a good charger.

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

dchomak
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Ordered 1 today, May 2nd.

blfdemigod
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HKJ wrote:

blfdemigod wrote:
HKJ, after reading this aricle about pulse charging http://2bfly.com/knowledgebase/battery-chargers/charging/ isn't it better for a charger to pulse charge

For NiMH is might be fine, but I have not seen any description that says it is fine for LiIon.

With puls charging you will have to use a higher current, if you want the same average charge current, this does mean more heat is created.

There is also the question about high current pulses into small batteries, how does it affect them?


blfdemigod wrote:
I am no expert in the battery field, but wouldn't the BT-C3100 be a good lithium ion battery charger as well as a battery analyzer, especially if the random spikes you have observed from your previous testing have been ironed out in the version 2.0 firmware update?

Before I see a document stating that high current charging pulses are ok for small LiIon batteries I will rate constant current chargers as better.

There is also the minor detail about the CC/CV, with a pulsing charger it is simulated, not a real CC/CV, usual the practical difference will be minor.

The above comments does not make this a bad charger, it is probably a good charger.

Ok thanks. And by small li-ion do you mean 10440, 16340, 14500, 18350? For those batteries, couldn't we just change the charge current to 200mah on this charger, or would that still be high current pulses going to the battery?

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HKJ
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blfdemigod wrote:

Ok thanks. And by small li-ion do you mean 10440, 16340, 14500, 18350?

Yes.

blfdemigod wrote:
For those batteries, couldn't we just change the charge current to 200mah on this charger, or would that still be high current pulses going to the battery?

The current pulse is always the same current, only the time changes (It is the same as PWM, i.e. a cheap way to make adjustable current).

This means a 10440 will also receive 3A charge pulses.

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

blfdemigod
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Ok, thanks HKJ! Now I got it!

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danjayh
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3 1/2 days since I placed my order and still not a peap from Gearbest or Dora (who I emailed directly a day and a half ago) on the status of my order. Paid for expedited shipping, still has not shipped. Suggestions, anyone?

tatasal
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danjayh wrote:
3 1/2 days since I placed my order and still not a peap from Gearbest or Dora (who I emailed directly a day and a half ago) on the status of my order. Paid for expedited shipping, still has not shipped. Suggestions, anyone?

Holidays May 1 to 3 in China. Before these days, Dora has indicated she will be ‘on-air’ May 4 (surprisingly it’s still a Sunday) . I’m sorry to hear your predicament. I notice the Chinese really take their holidays seriously. I haven’t heard a peep from her too.

danjayh
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tatasal wrote:
danjayh wrote:
3 1/2 days since I placed my order and still not a peap from Gearbest or Dora (who I emailed directly a day and a half ago) on the status of my order. Paid for expedited shipping, still has not shipped. Suggestions, anyone?

Holidays May 1 to 3 in China. Before these days, Dora has indicated she will be ‘on-air’ May 4 (surprisingly it’s still a Sunday) . I’m sorry to hear your predicament. I notice the Chinese really take their holidays seriously. I haven’t heard a peep from her too.

Yep. I know they’re on holiday now, but they had 2 full business days (ordered it late April 28 EST) to get it out before the holiday. I guess I’m just used to US e-commerce companies that always ship the same day as ordered. If this had been Amazon or Newegg, they’d refund the shipping fee and upgrade it to overnight. Ironically, the batteries that I ordered from DealExtreme a few days earlier with their standard ‘molasses’ shipping are already here.

Curry
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Great deal ! Decided against Efest luc and ordered now one Opus BT-C3100 with EU plug.

GLO
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I’ve just ordered and emailed Dora.

Thanks in advanced

GLO

Skylined
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I’ve used the points that I’ve gathered after buying the first unit, so my second one was 39.60 $ instead of 41 $. Smile

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dazed1 wrote:
Werner wrote:
Have I overseen something? This charger don’t charges 4 cells with more than 1A properly, but you all want to buy it?

There is no charger which can charge 4x cells (18650) @2A for this price, and even for 20$ more. IMHO this is the best charger one can buy atm for the money, followed by Effest LUC V4.

Even 1A didn’t work properly on v1 so I thought we would better wait for a new review of v2. I don’t want to check every battery after charging manually to check if it is fully loaded…

If they really fixed this I would also buy one but I am suspicious with all those Chinese promises…

tatasal
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As of this moment 133 units has been sold.

M4D M4X
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cool thing!

PLEASE NOTE
i do not work in "reviews, deals and codes" for the time being
maybe M4D M4X will return one day, but until then:

THANK YOU FOR YEARS OF YOUR SUPPORT AND FRIENDLY CONTACTS!

tatasal
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M4D M4X wrote:
cool thing!

Thanks

allthumbs
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Ordered 1 today May 4 Thanks
mhemling33
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Mine should be delivered tomorrow, I can’t wait.

dekelsey61
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What carrier did Gearbest use for the free shipping to the Us? Can not seem to track it. Mine was shipped a week ago. Thanks.

tatasal
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dekelsey61 wrote:
What carrier did Gearbest use for the free shipping to the Us? Can not seem to track it. Mine was shipped a week ago. Thanks.

I suggest you email dorawu13@gmail.com for that information with your shipping name and address

Mine was shipped April 29 but still shows ‘unable to track’ (though the tracking number is acknowledged) at this: http://www.17track.net/index_en.shtml

In my experience with Asian regular air mail services, it usually appears from 6 to 10 days from date of shipping for tracking to appear, unlike USPS and the much faster Fedex, UPS and DHL services.

jealous57
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My tracking number doesn’t work either…. but I am in no rush I am still waiting for my 18650s…. who knows when the hell they’ll be here, lol

tatasal
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“Only” 6 orders today. Might have to wind this down in the coming days.

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