Opus BT - C3100 V2.2 Smart Battery Charger


Charge Discharge Test Refresh 4 Channels for Li-ion NiCd NiMh Batteries
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Main Features:
NEW LED back light displays charging / discharging / quick test / circuit more clearly in the dark
NEW refresh mode can show you batteries' capacity, letting you know real magnitude
NEW added quick test mode to test the battery impedance
Four working mode available at user's choice: Charge, Discharge, Test, Quick Test and Refresh
● 4 independent charging slots charge rechargeable batteries of different types and sizes and with different capacities at the same time
● Charging current can be selected to be 200mA, 300mA, 500mA, 700mA or 1000mA ( 1500mA and 2000mA can be applied when only slot 1 or 4 is selected ). Default discharging current is 500mA
● Integrates the minus delta voltage ( -ΔV ) for NiCd or NiMh batteries charging termination, and for Li-ion batteries charging to 4.2V with pre-selected constant current. ( 3.7V Li-FeO4 and 4.35V high voltage batteries charging mode can be selected through switch on board )
● Easy-to-read LCD with back light showing battery Voltage, Charge / Discharge Current, Charging Time, Battery Capacity, etc.
● Includes overheat detection to protect rechargeable batteries and charger itself from overheating
● Designed for AA ( LR6 ) and AAA ( LR3 )NiCd, NiMH or 3.7V Li-ion rechargeable batteries in size type of 18650, 14500, 16340, 10440, also compatible with 10340, 18650, 26650, 26500 ( printed on the package ) and 17670, 18490, 17500, 17335 ( printed on the product )
● Operating temperature: 0 - 40 deg.C
● Max charging capacity: up to 20000mAh
● Power adapter: DC 12V, 3.0A ( output ), 100 - 240V, 50 / 60Hz ( input )
● Please NOTE: batteries are not included

1. Voltage update rate is 30s instead of 60s.
2. Charging voltage is regulated to 4.7V instead of 5.0V, thus loading on power adapter when batteries are flat is less. 5.0V charging voltage has problem in regulating the correct current level due to this over loading current on power adapter, which lead to Panasonic brand Li-ion batteries showed wrong charging capacity value ( + 25 percent ). With 4.7V charging voltage, the load on power adapter is greatly reduced and thus can make all types of batteries charged properly.
3. 4.35V charging time can be very long because charging current is regulated in entering the CV stage at 4.12V, which is same as 4.2V type. Now 4.35V charging algorithm is changed to 4.27V.
5. Better safety feature: PCB temperature was used to in controlling fan on / off only with 2.0V, now this function is enhanced so that temperature is monitored for entering thermal shutdown mode when excessive high temperature is reached. It is especially helpful when fan is not running and which can lead to plastic melt down happening.
6. New fan cover provides better protection for cooling fan.
7. Charging current range: 200mA, 300mA, 500mA, 700mA, 1000mA, 1500mA, 2000mA
8. Discharge current range:200mA, 300mA, 500mA, 700mA, 1000mA ( Li-ion batteries only )
9. Max. charging capacity: 20000mAh
10. Voltage deviation: < 0.03V @4.2V
11. Current deviation: < 5pct



Brand: Opus
Type: Charger
Model: BT-C3100 V2.2
Plug: EU adapter,UK plug,US adapter
Charging Cell Type: Lithium Ion,Ni-MH,NiCd
Compatible: 10440,14500,16340,18650
Charging Cell Qty: 4
Input Voltage: AC 100~240V 50/60HZ
Output Voltage: DC 12V, 3.0A


LCD Screen: Yes
Circuit Detection: Yes
Protected Circuit: Yes
Short Circuit Protection: Yes
Over Voltage Protection: Yes
Over Charging Protection: Yes
Over Discharging Protection: Yes

Dimension and Weight

Product weight: 0.2340 kg
Package weight: 0.5490 kg
Package size (L x W x H): 16.00 x 22.00 x 5.00 cm / 6.3 x 8.66 x 1.97 inches

Package Contents

Package Contents: 1 x Opus BT - C3100 V2.2 Intelligent Battery Charger, 1 x Power Adapter, 1 x English User Manual


This charger is an analyzing charger for LiIon and NiMH batteries, which means the charger can charge and discharge while measuring.


When the charger is turned on, it displays test where all the text can be seen. 
When startup is finished it is possible to select mode:

  • CHARGE: Charge battery with 200 to 1000 (2000) mA.
  • DISCHARGE: Discharge battery with 200 to 1000 mA.
  • DISCHARGE REFRESH: Discharge and charge the battery 3 times.
  • CHARGE TEST: Charge, discharge and charge the battery, show how much current was discharged.
  • QUICK TEST: Measure the internal resistance of the battery.

When display is flashing it is possible to select mode and current.
Using the slot button it is possible to reselect a slot and change parameters for it, also when charger is working.
When putting multiple batteries in the charger at the same time, it is possible to select mode and current simultaneous for all of them (Very nice).

When charging or discharging it is possible to use the DISPLAY button to select between V, mA and mAh.
The display button can also be used when the charge/discharge is finished, but the charger will change back to FULL display rather quickly.

Here is an example where I have selected different functions for each slot.

Each time a button is pressed, the light turns on for a 20 seconds.
The FULL and NULL message can also be seen.

The charger uses an external 12 volt power supply at 3A ( see later ).
It has a fan, this is necessary to handle all four channels at full power. Even with only one channel in use the fan, it start and stop very often. The fan is not very loud, but due to the starting and stopping it is very annoying.


The charger uses the classical slider construction to handle most battery sizes. The slider works smoothly and can handle sizes from 32mm to 72.5mm.
For measuring internal resistance the slider is not very good, it often has a high connection resistance.

A couple of different NiMH batteries in the charger.

And some LiIon batteries.

Using only slot 1 and 4, the maximum charge current is 2000mA.
In all other cases the maximum charge current is 1000mA.
The maximum discharge current is always 1000mA.

Charge currents: 200mA, 300mA, 500mA, 700mA, 1000mA, 1500mA, 2000mA

Discharge currents: 200mA, 300mA, 500mA, 700mA, 1000mA



The charger can easily handle 
70mm long batteries.
It is recommended to charge smaller batteries in the two center slots.
The charger has an internal switch marked with 3.7V, 4.20V and 4.35V. I have not tested this switch, because it is internal, but it might be possible to charge other Li-ion chemistries.

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Customer Reviews

4.86 out of 5
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  • p5bdkw
    BT-C3100 V2.2, An Excellent Charger
    Color:Purplish Blue Size:US Plug
    Backlit screen (will turn it off after 20 seconds)
    Backlit can be turned on permanently by pressing "DISPLAY" for 3 seconds.
    Charges Ni-Cd, NiMH and Li-ion batteries.
    Rubber feet.
    Approx. 3/16" bottom clearance
    6 internal temperature sensors.
    Small fan to exhaust heat.
    Fan noise has been improved from previous version (BT-C3100 V2.1).
    Excellent build quality.

    Has 5 MODES:

    Charges battery to maximum capacity.

    Discharges battery. Reduces the memory effect in the battery.

    Discharges, then charges battery 3 complete cycles to optimize it's
    maximum capacity.

    Checks the capacity of the battery.

    The charger checks the dynamic internal battery resistance.
    Consult manual for further details.

    This is an excellent, fun, easy to use, charger, that gives you total control of how
    you want to charge and maintain your batteries. A big plus is the ability to get the
    capacity of the batteries. The fan noise is considerably less annoying than the one
    on the V2.1 charger, IMHO. This charger is a great companion to my XTAR VP2.

    GearBest got it to me, fast!!!

    May 03,2015

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  • Lazzaro20
    Good charger
    Color:Purplish Blue Size:EU Plug
    This charger meets all my needs:
    It has a single channel charge, that is, you can upload an unlimited number of batteries, so that only one, two, three or all four simultaneously. This is important for me because I have a number of devices that only need a battery or three.
    Ordinary charger can only pairs (ie 2 or 4 at a time) load.
    You can combine the types of batteries colored, so you can simultaneously charge different capacity NiMH batteries and lithium ion batteries.
    Each span can individually adjust the charging current and the function.
    Functions dominates the charger following:
    * Download (Sure)
    * Exhaust (in order to avoid any memory effects with NiMH)
    * Refresh (charger repeatedly discharge and charge cycles until improvement in battery capacity you get more. So you can old batteries, or those who have long remained, still breathing a little 'life)
    However, Opus can also deal with Li-Ion batteries, and I have the chance to request a particular device in your home. Moreover, the battery of tests (measurement of internal resistance).
    I hardly use this feature however.
    A fan, the device is also to cool the batteries, which should become warm during charging. I was able to observe that the fans have already activated, very hot but the batteries were not.
    Conclusion: excellent charger handyman.

    Oct 28,2015

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  • GearDeal
    Opus BT-C3100 Version 2.2
    Color:Purplish Blue Size:EU Plug
    Chargeur universel intelligent livré dans une boite en carton avec une notice d'utilisation et un adaptateur EU.
    La finition du produit est correcte mais le plastique pas assez costaud pour lui offrir une
    résistance aux éventuelles chutes.
    A part ça, ce chargeur est intéressant du point de vu de ses possibilités et de son prix.
    Durant le chargement, le ventilo, de temps à autre, se met en marche et se fait entendre pendant quelques secondes.
    Globalement satisfait on verra dans le temps.

    This Opus version comes in a nice carton box with EU adapter and an operating
    instructions notice.
    Charger build quality is correct but plastic material is not strong enough in case of drop.
    Easy to start and use.
    One can easily follow charging phases individually and adjust features using different mode.
    Charging time is quiet fast.
    While charging fan become noisy for a few seconds (time to time)
    For now satisfied hope it will last.
    Last Gearbest price for this item is very competitive

    Vidéo de déballage /Unboxing : https://youtu.be/iBXfVkbuEHY

    Feb 25,2017

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  • Roman
    even better
    Color:Purplish Blue Size:UK Plug
    Bought it as a replacement to my 1st version of bt-c3100 by powerfocus that broke after inserting the battery in opposite way.
    It does much better job: you can top up battery that has for instance 4.16V - while previous version just notified about full battery
    It is much less obtrusive less noise from the fan, which works quieter and is on only when required.
    It does charging in some different way, battery that is old and has high internal resistance charges with smaller current, ends of charging cycle with smaller current than previous version of the charger
    Can charge two battery with 2A while previous version often just reset itself upon choosing 2 slots with 2A charging
    Overall I am very very happy about purchase, one can experience that this one is just better more refined device than previous one, however in the meantime I have notice there is new more advance charger available here - unfortunately
    The price here is the best I have came across by 30% than somewhere else!!!
    I wish it be able to charge with 3A....
    1 month in transit (but its my fault I have chosen Nederland surface post)

    Dec 08,2015

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  • andrey
    Opus BT-C3100 V2.2
    Color:Purplish Blue Size:EU Plug
    Product description matches product.
    Functionality is excellent and the device is easy to use.
    The build quality is sufficient.
    The charging algorithm has nursed a number of my cells back to life.
    can charge external batteries too after some remaking.
    comes in a well made box with a manual.
    universal device with outstanding price for it's abilities.
    can charge/disharge/test/refresh ANY type of battery - NiCd, NiMh, Li-ion with power rating at 200ma, 300ma, 500ma, 700ma, 1000ma, 1500ma, 2000ma
    can test battery resistance in Omhs.
    Li-Ion batteries can be charged up to 3,7v 4,2v 4,35v depending on the battery chemistry.
    has powerful durable power supply (12v 3A mean 36W)
    and built-in on-demand cooling fan.
    precise built-in voltmeter and ampermeter.
    good designed controls and display with backlight.
    Really none, except maybe for too weak and noisy fan.....

    Aug 08,2018

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  • Nas
    Great multipurpose Tester/Refresher/Charger
    Color:Purplish Blue Size:EU Plug
    This is the best vape charger for 18650 batteries. You can charge 2 batteries at 2A or all 4 batteries at 1A each.

    I love the "mAh meter" telling me how much charge was added to each battery, which also lets me know when it's time to recycle a battery for good because it isn't holding a charge as well.

    The fan is a little loud at times (especially when charging 4 batteries at 1A each) but I like knowing the fan is removing heat from the charging circuit.

    • Product description matches product
    • Functionality is excellent and the device is easy to use
    • The build quality is sufficient
    • The charging algorithm has nursed a number of my cells back to life
    • While charging, the device exhaust fan is a bit annoying, but its purpose is to spin and suck hot air.

    Jul 30,2016

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  • Bob
    Nice charger. You will charge EVERY battery you have in your house lol
    Color:Purplish Blue Size:EU Plug
    - Fits lots of battery sizes.
    - Keeppower 26650(protected) fit tight but it will do.
    - Nice and simple interface.
    - Eu charger included

    It is fun to see the charger work. When i first got it i spend the night watching its tiny but informative display. Scrolling true the different modes. I charger all sorts of batteries like 18650, 26650, AA, AAA. It all does this very well. Sometimes when it gets hot the little tiny fan on the back will spin, and make a little buzzing noice. At first i thought it was some sort of bug. So after spending 30 minuten shining in my room with a 5000 lumen flashlight i discoverd it was my new tiny little charger friend. I would advice this charger to all people who are on the hunt for a charger.
    Maybe not for this price but i would have liked someting like a simple plastic container to carry the charger in.

    Mar 08,2017

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  • Petro
    really great charger!
    Color:Purplish Blue Size:EU Plug
    universal device with outstanding price for it's abilities
    can charge/disharge/test/refresh ANY type of battery - NiCd, NiMh, Li-ion with power rating at 200ma, 300ma, 500ma, 700ma, 1000ma, 1500ma, 2000ma
    can test battery resistance in Omhs
    Li-Ion batteries can be charged up to 3,7v 4,2v 4,35v depending on the battery chemistry
    has powerful durable power supply (12v 3A mean 36W)
    and built-in on-demand cooling fan
    precise built-in voltmeter and ampermeter
    good designed controls and display with backlight
    can charge external batteries too after some remaking
    comes in a well made box with a manual
    really none, except maybe for too weak and noisy fan

    Mar 31,2016

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  • Mick Dean
    Color:Purplish Blue Size:US Plug
    Moved onto serious chargers when I started vaping, all well regarded brands. The first died totally after three months, possibly because I left it plugged in during a power cut and there may have been a surge when it came back. My second, 2 slot charger, became a 1 slot after a few months.
    The Opus is excellent. Takes a bit longer to figure out than the others, but that is because it has more functions. Fast charging facility if I was ever stupid enough to let 20+ batteries go flat at the same time. The refresh mode has revived a couple of old batteries relegated to the ohm meter.
    Not expensive for the build quality and functions.
    Excellent display.
    Clear instructions.
    None as yet.

    Mar 21,2017

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  • BULL
    Opus BT - C3100 V2.2 Li-ion Digital NiCd NiMH Battery Charger EU Plug
    Color:Purplish Blue Size:EU Plug
    This charger can charge 2 batteries at up to 2000mA (useful if you use 26650) or 4 batteries up to 1000mA, it can test the true capacity and internal resistance of your batteries, has a nice fancy screen that can show you more information than competitor chargers and fan assisted cooling that surprisingly isn't too loud. The battery tracks aren't the smoothest I've come across but they can be manipulated easily enough with one hand to insert or remove batteries and you could always grease it up a little bit to make it smoother. Just pop your battery in set the mode and current you want to use and away you go

    Dec 13,2016

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