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BT - C3100 V2.2 Universal Battery Charger Speedy LCD Display Smart Battery Charger for Rechargeable Batteries Ni-MH Ni-Cd AA AAA,3.7V Li-ion 18650 26650 17670 14500 18490 (4-Slot)

4.5 4.5 out of 5 stars 790 ratings

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Brand OPUS
Color purple
Product Dimensions 1.54"D x 3.86"W x 5.67"H
Item Weight 0.52 Pounds
Output Voltage 12 Volts

About this item

  • Plug: US adapter,Charging Cell Type: Ni-MH, NiCd, Lithium Ion,Designed for AA ( LR6 ) and AAA ( LR3 NiCd, NiMH or 3.7V Li-ion rechargeable batteries in size type of 10440, 14500, 16340, 17335, 17500, 18490, 17670, 18650
  • Note: Battery not included,The charging current can be selected to be 200mA, 300mA, 500mA, 700mA or 1000mA (1500mA and 2000mA can only be applied when only slot 1 or 4 is selected). Default discharging current is 500mA
  • It provides four independent charging slots for rechargeable batteries. The charger can charge batteries of different types and sizes and with different capacities at the same time
  • Four Working Mode Available at User's Choice: Charge, Discharge, Test, Quick Test and Refresh,The charger also includes overheat detection to protect rechargeable batteries and charger itself from overheating
  • 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.
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Opus BT - C3100 V2.2 Universal Battery Charger Speedy LCD Display Smart Battery Charger for Rechargeable Batteries Ni-MH Ni-Cd AA AAA,3.7V Li-ion 18650 26650 17670 14500 18490 (4-Slot)
Opus BT - C3100 V2.2 Universal Battery Charger Speedy LCD Display Smart Battery Charger for Rechargeable Batteries Ni-MH Ni-Cd AA AAA,3.7V Li-ion 18650 26650 17670 14500 18490 (4-Slot)
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PriceCurrently unavailable.$29.47-5% $39.43
Typical:$41.50
$59.93$45.99$59.39
Delivery
Get it as soon as Sunday, Mar 24
Get it Mar 22 - 27
Get it as soon as Sunday, Mar 24
Get it Mar 22 - 27
Customer Ratings
Accuracy
4.5
3.5
5.0
3.0
4.7
Value for money
4.2
4.0
4.3
3.3
4.5
Easy to use
4.6
4.5
4.7
Easy to read
4.6
4.7
4.7
Sold By
AllmaybeDirect
Amazon.com
DC Workshop
AllmaybeDirect
DC Workshop
input voltage
240 volts
3.6 volts
5 volts
240 volts
1.2 volts
240 volts
weight
0.52 pounds
0.33 kilograms
225 grams
1.41 pounds
0.65 kilograms

Product information

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Opus BT - C3100 V2.2 Universal Battery Charger Speedy LCD Display Smart Battery Charger for Rechargeable Batteries Ni-MH Ni-Cd AA AAA,3.7V Li-ion 18650 26650 17670 14500 18490 (4-Slot)


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Product Description


Main Features:
The charger integrates the minus delta voltage for NiCd or NiMh battery charging termination, and for Li-ion batteries charging to 4.2V with pre-selected constant current. ( 3.7 Li-FeO4 and 4.35 type 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.
Operating temperature: 0 - 40 deg.C
Max charging capacity: Up to 20000mAh
Power adapter: DC 12V, 3.0A ( Output ), 100 - 240V, 50 / 60Hz ( Input )
Highlight:
1. Voltage update rate is 30s instead of 60s.
2. 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
3.35V charging algorithm is changed to 4.27V.
4. New fan cover make better protection for cooling fan.
5. Charging current range ( mA ): 200, 300, 500, 700, 1000, 1500, 2000
6. Discharge current range ( mA ):200, 300, 500, 700, 1000 ( li-ion cell battery only )
7. Max. charging capacity: 20000mAh
8. Voltage deviation: max 0.03V 4.2V
9. Current deviation: max 5%
Type: Charger
Brand: Opus
Model: BT-C3100 V2.2
Rechargeable Battery Qty: 4
Input Voltage: AC 100~240V 50/60HZ
Output Voltage: DC 12V, 3.0A
LCD Screen: YES
Auto Circuit Detection: YES
Built-in Protected Circuit: YES
Over Voltage Protection: YES
Short-Circuit Protection: YES
Over-Charging Protection: YES
Over-Discharging Protection: YES
Battery Quantity: 4
Package weight: 0.558 kg
Product size (L x W x H): 14.4 x 9.8 x 3.9 cm / 5.66 x 3.85 x 1.53 inches
Package size (L x W x H): 16 x 22 x 5 cm / 6.29 x 8.65 x 1.97 inches
Package Contents:
1 x Opus BT - C3100 Battery Charger
1 x US Power Adapter
1 x English User Manual

Customer reviews

4.5 out of 5 stars
4.5 out of 5
790 global ratings

Customers say

Customers like the charging and discharging features of the battery charger. They say it has multiple functions for charging and discharging, and that it works great as expected. Customers are also impressed with the speed, saying it works very well for 18650 battery types. They also appreciate the accuracy, saying the charger accurately measures battery output. Customers also like the ease of use. However, some customers dislike noise. Customers have mixed opinions about the quality, heat, and charge of the charger.

AI-generated from the text of customer reviews

160 customers mention131 positive29 negative

Customers like the charging capabilities of the battery charger. They mention that it has multiple functions for charging and discharging, and it charges or discharges each bay individually. Customers find the multiple functions useful for reconditioning older cells. The charger is easy to use and can charge or discharge to test capacity. Customers also appreciate the ability to set the charge and discharge rate, but the default works just fine. Overall, customers are satisfied with the charging capability of the charger.

"...based on several YouTube videos and the charger's ability to test and charge cells individually...." Read more

"...Third, the charge is accurate with a wide range of options and voltages to choose from...." Read more

"...This worked on mine as well.Again... Great charger." Read more

"This charger is extremely useful for determining battery health. It can charge, discharge test, recondition, and test resistance and it can take NiMH..." Read more

139 customers mention126 positive13 negative

Customers are satisfied with the speed of the battery charger. They mention that it works great as expected, it doesn't run hardly at all, and works very well for 18650 battery types. The results are amazingly consistent, and there are no issues with the charger.

"...Overall this product works as advertised, and performs perfectly on both large and small jobs.Recommendation:Damn Good Buy!" Read more

"...The results are amazingly consistant. The voltage of Fully Charged batteries has been exactly the same for all batteries...." Read more

"...it only comes on as required for thermal regulation and it doesn't run hardly at all unless you are in the discharge portion of a test...." Read more

"...It does a great job of this and will tell you individual cell impedance in milliohms and total capacity in milliamp hours..." Read more

52 customers mention37 positive15 negative

Customers like the accuracy of the battery charger. They say it's great for testing lots of 18650 batteries, and it accurately measures the batteries output. Customers also appreciate the ability to test capacity in mAh and the refresh feature. They also appreciate that it' s easy to use and can independently test capacity of 4 cells at the same time. Overall, customers are happy with the accuracy and functionality of the product.

"...purchase, and dozens of charge cycles, all of my batteries still test perfectly with no degradation of capacity...." Read more

"...It will also allow you to see the final voltage of the battery and also how many mAmp hrs. were actually loaded into the battery...." Read more

"...usually in the center 2 "bays" and reporting odd values (like charge-time starting at 44:00 instead of 00:00)...." Read more

"...Third, the charge is accurate with a wide range of options and voltages to choose from...." Read more

35 customers mention25 positive10 negative

Customers find the battery charger easy to use. They mention that the menu is easy to navigate, and the batteries remove and install easily. The product is great quality and works great for getting batteries. Some customers find the written instructions confusing on usage, but the UI is excellent and the charge/test functionality is extremely useful with purchasing cheaper Li-ion batteries.

"...charges for different bays can be a little wonky, but it's easy to figure out and get used to...." Read more

"...PROS* It comes with an A4 instructions sheet.* Very easy to use* Independently test capacity of 4 cells at the same time..." Read more

"...The user interface is a little bit clumsy to figure out at first, but once you become accustomed to it, it's not too bad...." Read more

"...studied the manual and understood how it works I found it simple to use on a daily basis (don't skip reading the manual!)...." Read more

62 customers mention43 positive19 negative

Customers are mixed about the quality of the battery charger. Some mention it has many useful features, the build quality seems fantastic, and is reliable. Others say it's very cheaply built, has a faulty fan, or has bad bearings.

"...But this unit isn't dumb...." Read more

"Everything arrived correctly, just as published by the seller. I recommend it" Read more

"...It's very cheaply built and has the feel and look that it is an afterthought for the USA market..." Read more

"...All the various functions work as advertised. It seems to be reasonably well made...." Read more

45 customers mention20 positive25 negative

Customers have mixed opinions about the heat of the battery charger. Some mention that it has a fan to keep it cool, while others say that it overheats and shuts down to a 0ma rate. The control monitor and a cooling fan built into the system do a very nice job, but some customers say that the internal fan is not adequate enough for 1C discharging and that the whining sound of a failed cooling fan.

"...reeked of the smell of a circuit board that had some severe thermal damage. It smelled like something on the PC board had been burned...." Read more

"...protection: It has a temperature control monitor and a cooling fan built into the system and it does a very nice job...." Read more

"...Most other chargers don’t need one and there’s no option for passive heat dissipation...." Read more

"...let the batteries rest before use, but I still like that they aren't hot after charging...." Read more

41 customers mention25 positive16 negative

Customers are mixed about the charge of the battery charger. Some mention that it's easy to use, has high charge and discharge rates, and can drain your batteries fully. It's awesome and never overcharges, and it will test your battery capacity and may refresh batteries that have been abused. However, others say that their batteries seemed not to last as long after being charged with this unit, and that it reduces overall life span.

"This charger is extremely useful for determining battery health...." Read more

"...Its not a CV (constant voltage) charger. It does a slight overvolt to get the amperage moving...." Read more

"...This is a useful function for erasing battery memory and re-optimizing the amount of charge that can be put into the cell, especially in older..." Read more

"...The fact that it will actually bring some dead batteries back to life, instead of just getting rid of them to a recycling station is a great feature..." Read more

43 customers mention7 positive36 negative

Customers are not satisfied with the noise produced by the battery charger. They mention that the fan is very noisey, can be heard in the background on conference calls, and makes a beeping screeching sound. Some customers also report that the charging process makes grating sounds.

"...The fans will try to spin up and make a hell of a noise because they are out of balance or something...." Read more

"...The fan can be loud, or just high pitched, so I wouldn't want this thing in my bedroom...on in the master bath, but anywhere else is fine as it's..." Read more

"...has a cooling fan that runs during the discharge cycle that puts out a bit of noise---not a lot, but enough to be pesky if you're trying to watch a..." Read more

"...Not too long after receiving the fan started to make an awful grinding/grating sound, it was loud enough to be heard across my house...." Read more

Works Really Well
5 Stars
Works Really Well
When I saw the price of this battery charger and tester, I almost passed on buying it. I went ahead and bought it to give it a try based on the reviews. I am glad I went ahead and got it.I really like the fact that you can charge as many batteries as you want to charge, from a single battery to four at once, with this charger and tester. I also like the way it plugs into the wall outlet with the transformer plugging into the outlet and having a cord so it can moved around on the counter while the batteries are charging. I had several old rechargeable batteries and I knew some of them were not good anymore and with this charger I was able to charge and test all of my AA and AAA NMH and NiCad batteries. I found four batteries that were no good and would not take a charge and was able to get four batteries that would not charge with a standard charger to take and hold a charge with the discharge refresh cycle built in to this charger and tester. I want to note here that I had tried to charge the batteries that came back to life with a standard battery charger they came with for two days before placing them in the new charger, but the new tester showed they had not taken a charge and showed zero voltage when first put in the new charger and tester. The ability to find the bad batteries is reason enough alone to warrant the purchase of this charger. The fact that it will actually bring some dead batteries back to life, instead of just getting rid of them to a recycling station is a great feature and makes it an even better value. After changing some of the original settings I did unplug the unit to reset it to the factory charging settings. The fact I had to unplug it and start over again was not a big deal to me but was a bit of an inconvenience. I also like the fact that this unit has a fan that runs when needed to help keep the batteries and the charging unit cool. I didn't notice any overeating problems when charging either the good batteries I had or the batteries that were no longer any good.I would definitely buy this charger and tester again based on the experience I have had so far. I wish I had bought it sooner so I could have gotten rid of the batteries that weren't any good.
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Reviewed in the United States on December 5, 2017
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Cristian E.
2.0 out of 5 stars Buena calidad de materiales pero LCD dañada
Reviewed in Mexico on April 5, 2022
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Cristian E.
2.0 out of 5 stars Buena calidad de materiales pero LCD dañada
Reviewed in Mexico on April 5, 2022
Acaba de llegarme este cargador, por todos los buenos comentarios que tiene decidí comprar este, sin embargo me llegó dañado de la LCD, algunos indicadores no encienden, por lo que procederé a hacer un cambio con la esperanza que el segundo me llegue en buen estado, por el momento solo por eso pongo 2 estrellas, con la intención de subirlo a 5 estrellas una vez probado el segundo intento
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Bill Richards
5.0 out of 5 stars Very nice charger/tester
Reviewed in Canada on February 4, 2019
Adbas
5.0 out of 5 stars Excellent charger
Reviewed in Canada on January 28, 2019