---
product_id: 143888476
title: "Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650"
brand: "opus"
price: "¥22270"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/143888476-opus-battery-charger-analyzer-tester-for-li-ion-nimh-nicd
store_origin: JP
region: Japan
---

# Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650

**Brand:** opus
**Price:** ¥22270
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650 by opus
- **How much does it cost?** ¥22270 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/143888476-opus-battery-charger-analyzer-tester-for-li-ion-nimh-nicd)

## Best For

- opus enthusiasts

## Why This Product

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

## Description

Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 7 x 4 x 2 inches |
| Item Weight | 1.26 pounds |
| Manufacturer | OIC Ltd |
| ASIN | B07T941JCF |
| Item model number | BT-C3400 |
| Is Discontinued By Manufacturer | No |
| Date First Available | June 18, 2019 |

## Product Details

- **Brand:** Opus
- **Color:** Black
- **Product Dimensions:** 4"D x 7"W x 2"H
- **Output Voltage:** 12 Volts (DC)
- **Specification Met:** RoHS, UL, CE, FCC

## Images

![Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650 - Image 1](https://m.media-amazon.com/images/I/71tnuD6P-LL.jpg)

## Questions & Answers

**Q: This is just a rebadged 3100 v2.2 why are you charging more than $10 more for the same device?**
A: A couple of differences that I noticed:
-- The BT-C3400 came with a car 12V power cable while my BT-C3100 did not.
-- The BT-C3400 seems to have a continuous PWM fan control, varies the fan speed as needed so it is generally quieter while the fan on the BT-C3100 is either on or off, switches often.

**Q: The opus c3100 when you remove screws inside there is a switch to change voltage so you can charge lifepo4 batteries. Does this have such a switch?**
A: The switch is located inside the bottom cover, you need to remove the screws and then remove the bottom cover, there you will find a small 3 position switch with the different voltage options. What some people do is to use a dremmel to make a hole on the bottom cover so they can access the switch without having to remove the screws. Check google, there you will find tons of pictures and illustrations that show how to access the switch and so forth. Just keep in mind to use the correct voltage for the type of lithium battery that you will be charging, this is extremely important.

**Q: Do you have a charger that will fit a 21700? i just received this and a klarus 21700 does not fit!**
A: I do not. I no longer advertise that chargers fit 70mm cells. Most 70mm cells that are protected are actually longer than 70mm as you have found out. The sliding contacts in the C3400 will reach for a cell that is 70mm however most 21700 and other 70mm cells do not fit, they are too long. It is an aggravating situation as it seems most cell manufacturers are exceeding length. Sorry.

**Q: Is this a cc/cv (constant current / constant voltage) charger?**
A: The charge current can be adjusted to 200, 300, 500, 700 or 1000 Ma. The discharge rate can be adjusted 200, 300, 500 or 700 Ma for NiMH/NiCd and 1000 Ma for Li-ion.

## Frequently Bought Together

- Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650
- Eneloop Panasonic BK-3MCCA8BA AA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries, 8-Battery Pack
- Eneloop Panasonic BK-4MCCA10FA AAA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries, 10-Battery Pack

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**Shop now:** [https://www.desertcart.jp/products/143888476-opus-battery-charger-analyzer-tester-for-li-ion-nimh-nicd](https://www.desertcart.jp/products/143888476-opus-battery-charger-analyzer-tester-for-li-ion-nimh-nicd)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-09*