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

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

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?

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?


[quote=blfdemigod] 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? [/quote]

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.

Ordered 1 today, May 2nd.

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?

Yes.

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.

Ok, thanks HKJ! Now I got it!

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.

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

I’ve just ordered and emailed Dora.

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

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…

As of this moment 133 units has been sold.

cool thing!

Thanks

Ordered 1 today May 4
Thanks

Mine should be delivered tomorrow, I can’t wait.

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.