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

Gearbest’s product page has this listed:

Package Contents: 1 x Battery Charger, 1 x US Power Adapter, 1 x Manual

http://www.gearbest.com/chargers-batteries/pp_24168.html#.U04yJqJLPQU

By the looks of the unit, it doesnt seem like a suitable plugged PSU would be hard to get anyway. Many might already have them.

Yeah, a high-amperage, regulated 12VDC power supply is not actually hard to come by if anyone wants a stable power supply.

doras mail (#49) clears it up!

top service!

Do that mean the group buy won't start & end before HKJ has tested it? I'm in if so.

I’ll sure wait, and even if i can’t buy it in the gb i can still order it for 4$ more from bg.

Yes.

Tomorrow Dora of Gearbest is expecting to receive the new power supply. Then it will be sent to HKJ for a quick review.

I hope it is a complete charger, not only the power supply.

PM sent. Thanks

Edit: HKJ no longer has the version that he tested/reviewed.

This post is from Henry Xu, the chief engineer of the BT-C3100: Reply concerning HKJ’s conclusion
(copy/pasted for his post #145 Review: Opus BT-C3100 ("dreamcharger!")
Post # 145

1. The charger is oscillating and stops the charging a bit too premature
This has been solved by firmware update: charger will make no current increase back in the CV stage. So no oscillating at all circumstances.

2.The “resting”/overheating periods during 2A charging or 4 × 1A discharge

2A charging is supposed to be used for high capacity Li-ion batteries, we should mention this in user manual that charging with ni-mh AA batteries with 2A charging current is not appropriate. Since 1A discharge current for 4 pcs li-ion batteries will generate a lot heat, and the fan exhausting speed is not fast enough.So it can lead to thermo-protection kicked in, which this safety mechanism is designed for. So I hope it is acceptable. If only two batteries is discharged at 1A speed, it should be no problem.

3. Power spikes from the power supply
We noticed for 9A peak current with very little period time of less than 10ms. we improved this problem by adding a larger enough filtering capacitor and its peak current now is reduced to 7A. The problem is not 100% solved, however it is improving the power supply quality significantly.

4. Uses trickle charging for NiMH when cell is fully charged
I think trickle charging current for nimh is necessary. And we believe this is a good feature of this charger. We have no plan to take this trickle charging away for nimh batteries. For li-ion batteries, there is no trickle charge current.

I would like to purchase one ( 1 ) charger.

Thank you.

Can anyone comment on how this deal varies from the version listed as a BC3100 in this previous deal for $45? Presumably they either will both have / not have the oscillation problems (although since it results only in minor li-ion undercharging, it’s probably not a big deal anyway)?: Deal alerts for Banggood.com - BTU Shocker, SolarStorm, Olight, XinTD...

Well, I guess I’m in for one as well, since I really prefer proper slots over the mess of wires & magnets with a hobby charger. If I’m understanding this right, it looks like they addressed the power spike issue within the charger itself rather than using a higher current power supply. I wonder if we can add an even bigger capacitor to “improve” it more? What will it do to the life expectancy of the power supply by drawing over twice the rated current, even over such short time periods?

KuoH

In for 1 unit iff HKJ is able to confirm that issues are resolved.

EDIT - Emailed Dora with the above…

In for 1 unit and emailed to Dora.

actually joined up to participate.

welcome to BLF

I cross-posted this deal over at SlickDeals. If any of you are also SD members, go thumbs up it & help answer people’s questions and maybe we can get a few more towards the 50 unit goal.

http://slickdeals.net/f/6874960-opus-bt-c3100-dream-charger-analyzer-for-nimh-lion-rechargeable-batteries-group-buy-41

Hi BLF,

Is this group buy for US version only, or EU will be down to $41 either?
http://www.gearbest.com/chargers-batteries/pp_24924.html

Opus BT-C3100 LI-ion NiCd NiMh LCD Smart Intelligent Battery Charger with EU Adapter - Black

I think it comes with an EU like in most photos, with a US adapter.

Taken from post #49