OPUS BT-C3100 Digital Intelligent 4 Slots LCD Battery Charger For Li-ion NiCd NiMH AA AAA 10440 18650 Rechargeable Batteries
ID: 62041

OPUS BT-C3100 Digital Intelligent 4 Slots LCD Battery Charger For Li-ion NiCd NiMH AA AAA 10440 18650 Rechargeable Batteries

4.9 (828 votes) | 1704 orders
Price: US $71.42 - 76.30 / piece
Discount Price:
US $ 60.59 - 64.67 / piece
Ships From
Socket Standard

OPUS BT - C3100 Digital Intelligent 4 Slots LCD Battery Charger For Li-ion NiCd NiMH AA AAA 10440 18650 Rechargeable Batteries

This charger is a analyzing LiIon and NiMH charger, this means the charger can both charge and discharge while measuring. The total number of function is large and this means the technical section in this review is very large.

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.


Item type:Battery Charger

Voltage update rate is the 30s instead of 60s.

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 a problem in regulating the correct current level due to this overloading current on the power adapter, which leads 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.

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.

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 an excessive high temperature is reached. It is especially helpful when the fan is not running and which can lead to plastic meltdown happening.

New fan cover provides better protection for the cooling fan.

Charging current range: 200mA, 300mA, 500mA, 700mA, 1000mA, 1500mA, 2000mA

Discharge current range:200mA, 300mA, 500mA, 700mA, 1000mA ( Li-ion batteries only )

Max. charging capacity: 20000mAh

Voltage deviation: < 0.03V @ 4.2V

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: 10440,14500,16340,18650,18500,26650,17500。

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

Package Include:

1X Opus BT - C3100 V2.2 Intelligent Battery Charger

1X Power Adapter

1X English User Manual

  • Brand Name: Opus
  • Origin: CN(Origin)
  • Display screen: Yes
  • Quick charge: Yes
  • Type: Electric
  • Intelligent Charge: Yes
  • Certification: CE
  • Package: Yes
  • Model Number: OPUS 3100
  • Use: Standard Battery


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some location we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:

Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, if you’d like a refund you can request one no matter the reason.

If you did not receive the product within the guaranteed time(60 days not including 2-5 day processing) you can request a refund or a reshipment.

If you received the wrong item you can request a refund or a reshipment.

If you do not want the product you’ve receive you may request a refund but you must return the item at your expense and the item must be unused.

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of CNTRONIC Consumer Electronics Retailer (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of cntronic.com

*You can submit refund requests within 15 days after the guaranteed period for delivery (60 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.



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