Any Opus BT-C3100 User's here?

Anyone impressed or unimpressed with the charger or it’s cell capacity information ?

New, better review video thanks to @Sprkslfly

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This is the other one I’ve seen talked about. Like you, I wonder if either is really good.

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I talked about this one a couple years ago, and from all preliminary indicators, it looked to be be the very best of the bunch at this price point.
(That post is still on file here FWIW)

Two years later though, and I have to say… IME, those impressions were dead on.

The last line sums up my thoughts.
(And I still believe there is nothing even close to the quality of build, and the performance. FYI, I charge at a rate of 500mah)


@Sprkslfly I appreciate the feedback. Which one had you mentioned previously, as I cannot find either here on ELR besides a single post that linked to another review.

This is my post from July 2016:

I ended up going with the BT-C3100 v2.2, and have been completely impressed, and way beyond satisfied. Not just with the performance, but the longevity as well.

I feel like the current condition of the batteries I’ve charged on it speaks volumes!

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Thank you for the linkage.

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I got one last week in the mail… v2.2
I come from a usb-charger with only an indication of whether it’s charging or not, so I can’t be anything but impressed. Looks like it’s decent stuff but I can’t say much about how long it’ll keep doing its job, still brand new with only a dozen or so charges.

I like the fact that you can charge different types of batteries, different settings per charging slot, fast charging, slow charging, draining battery, battery test and what else. My batteries are charged at 4.19V when full, I can see how long they’re been charging, how much energy went in, … and it’s all cooled with a fan, has heat protection, …

More than I need really but I paid as much for this as a friend for a very basic 2-slot battery charger from nitecore in a local shop.


You might also mention that it’s been updated since this video to v2.2 (which IIRC had improvements to the fan, and another minor point or two), as well as a noticeable price drop!

If memory serves, I paid about $40 for mine two years ago. (A far cry below the $60 he mentions) :wink:

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I have one and I loves it :grin:


@Sprkslfly hey bro, could you tell me what you think of this one? I love the features


Xtar Dragon VP4 Plus Li-ion/NiMH/11.1V 3S Charger and Battery Analyzer
SKU:Xtar Dragon VP4 PLUS
Availability: In Stock

$67.49 REGULAR PRICE $89.99
The Dragon VP4 Plus is Xtar’s top of the line battery charger and analyzer with a maximum charge rate of 2A on the outer two slots, and a system max of 1A for all 4 slots. The built in battery analyzer can discharge and recharge batteries displaying the capacity discharged and charged. The built in test leads will measure internal resistance in a battery as well as display the voltage. USB output and a 11.1V 3S dedicated charge port for lipo packs makes this one of the most feature rich chargers we carry.


Test battery internal resistance and voltage
Test battery real capacity
Charge all popular Li-ion/Ni-MH batteries and 11.1V battery packs
Optional 0.5A/1.0A/2.0A charge currents
REFRESH Mode to eliminate memory effects
USB output function
Informative big LCD screen display
Record function
Input Power:DC 12V 3A
Cut-off voltage:
Li-ion 4.2V +/- 0.05V
Ni-MH/NiCD: 1.45V +/- 0.1V
USB Output Function: DC 5V 2.4A Max
11.1V/3S Battery Pack Charging Current: 1.0A
Charge current: 0.5A x 4, 1.0A x 4, 2.0A x 2

Dimensions: 158mm x 147mm x 40mm
Weight: 345g(without batteries and power cord)
Compatible with:
Li-ion: 10440/14500/14650/16340/17500/17670/18350/18490/18500/18650/18700/20700/21700/22650/25500/26650/32650
Battery Pack: 11.1V/3S Battery Pack

What’s Included:
DRAGON VP4 Plus, Charger carrying pouch, probes, 12V/3A adapter, 3A Car adapter, Manual, Warranty Card



This is a plus for me, having 18650, 20700 and 3s lipos to charge. It is on my wish list.