---
product_id: 75938952
title: "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)"
brand: "opus"
price: "A$143"
currency: AUD
in_stock: true
url: https://www.desertcart.com.au/products/75938952-opus-bt-c3100-v2-2-universal-battery-charger-speedy-lcd
store_origin: AU
region: Australia
---

# 1000mA max 4 slots overheat protection 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)

**Brand:** opus
**Price:** A$143
**Availability:** ✅ In Stock

## Summary

> 🔌 Power Up Your Life with Smart Charging!

## Quick Answers

- **What is this?** 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) by opus
- **How much does it cost?** A$143 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/75938952-opus-bt-c3100-v2-2-universal-battery-charger-speedy-lcd)

## Best For

- opus enthusiasts

## Why This Product

- Trusted opus brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Lightweight:** Perfect for on-the-go charging at just 0.52 lbs!
- • **Enhanced Safety Features:** Smart thermal shutdown to protect your batteries.
- • **Versatile Charging Modes:** Select from Charge, Discharge, Test, Quick Test, and Refresh.
- • **Charge Multiple Batteries:** Simultaneously charge different types and sizes!
- • **Customizable Charging Current:** Choose from 200mA to 1000mA for optimal performance.

## Overview

The BT - C3100 V2.2 Universal Battery Charger is a versatile and efficient charging solution for a wide range of rechargeable batteries, including Ni-MH, NiCd, and various Li-ion types. With four independent slots, customizable charging currents, and enhanced safety features, this charger is designed for both convenience and reliability.

## Description

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)

## Features

- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 0.52 Pounds |
| Item Dimensions D x W x H | 1.54"D x 3.86"W x 5.67"H |
| Current Rating | 3 Amps |
| Input Voltage | 240 Volts |
| Output Voltage | 12 Volts |
| Color | purple |

## Product Details

- **Brand:** OPUS
- **Color:** purple
- **Product Dimensions:** 1.54"D x 3.86"W x 5.67"H
- **Item Weight:** 8.32 ounces
- **Output Voltage:** 12 Volts

## Images

![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) - Image 1](https://m.media-amazon.com/images/I/513A3qFOAcL.jpg)

## Questions & Answers

**Q: What is the difference between the c3100 and the c3400?  is it just the car charger comes with the c3400?  tyia**
A: Some people responding to this question need to read more carefully. The question was about the difference between the C3100 and C3400 (NOT the C2400). The BT-C3400 can be bought with or without the car charger. Obviously, the one without the car charger is cheaper (but not offered on Amazon at this moment). Typically the BT-C3400 without the car charger is still a few dollars more expensive than the BT-C3100. As far as the charger itself, both models are *almost* identical, but supposedly intended for different markets. The BT-C3100 with the most recent firmware has a Lithium discharge cutoff voltage of 2.8 volts. The BT-C3400 has a discharge cutoff of 3.1 volts. Opus claims the change was made to be more in align with international standards. Some people also think that the 3.1 volt discharge cutoff is better for the batteries, but LiIon batteries should never be stored long term at either of these voltages.
Be aware that both models have a hidden voltage selector switch under the back cover than will allow you to do a storage charge of 3.7 volts on standard LiIons. There is also a 4.35v charge mode setting that allows charging LiHV cells.

**Q: Can this charger be used with Netgear Arlo rechargeable batteries at 2300 mah wen 2000 mah looks like max output from charger?**
A: The maximum battery capacity this charger can handle is 20,000mAh. This should not be confused with the maximum charging current of 2000mA.Note that Capacity (mAh) = Current (mA) * Time (h). That means to recharge a 20,000mAh battery at 2000mA will take ~10 hours.

**Q: Does this have the ability to test batteries strength? not just good/bad but how many volts and amps it will put out**
A: It has quick test which I believe is the battery impedance.   Multiply the battery impedance times the current draw of your application. The result is the voltage drop internal to the battery.  If that number is significant, like more than about a few % of the battery voltage the loss will heat up the battery.
The most discharge current is 2000 mA or 2 Amperes.

**Q: Which version currently ships? v3.1, as in bt-c3400?**
A: The one I got has this on the label :
 Under the upc barcode:
 X0014AV9TH 

 Part number :
Opus BT - C3100 V2.2 Dig... - 
US Plug (Purplish Blue) 

The case, the plug and the cable are all black. The only thing I can see that would relate to the purplish blue reference is the color of the LCD screen once it is plugged in to the power outlet. Otherwise the entire physical charger cable and plug are all black. 

It works great for me.

## Frequently Bought Together

- 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 available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-23*