Opus BT-C3400 4-Channel Battery Charger & Analyzer for Li-ion NiMH NiCd – AA/AAA/C/18650

Overview

Meet the Opus BT-C3400, a compact four channel charger and analyzer built for a wide range of cylindrical cells. It supports Li-ion, NiMH, and NiCd packs, with four independent channels that can be programmed individually or run together. This flexibility helps you streamline testing, conditioning, and charging tasks without juggling multiple devices.

What you can do

Each channel handles charging, discharging, conditioning, or analysis, and you can operate all four in unison or separately to fit your workflow. Notable operating modes include five per channel: Charge, Discharge, Discharge Refresh, Charge Test, and Quick Test. Negative delta V detection aids NiMH and NiCd packs during full charge, while Li-ion cells follow a CC/CV charging profile for safe and controlled conditioning.

Key capabilities

• Independent channels with per channel programmability
• Charge, discharge, condition, or analyze up to four batteries at once
• Adjustable charging rates from 200 to 2000 mA per channel
• Maximum 2000 mA total charge current; up to 1000 mA discharge current
• Backlit LCD displays capacity, voltage, time elapsed, and current for quick at-a-glance readings
• Supports NiMH NiCd and a wide range of Li-ion cell sizes

Why this matters in real life

Whether you’re stocking a workshop, maintaining a hobbyist battery collection, or testing batches of cells, the BT-C3400 offers visibility and control. It covers NiMH/NiCd sizes from AAAA through SubC and a broad set of Li-ion formats, including common sizes like 10440, 14500, 18650, and more. The result is a versatile tool that helps you assess readiness and performance without guessing.

Power, compatibility, and extras

• AC input: 100 240 VAC, 50 60 Hz
• Adapter output: 12 V DC, 3.0 A
• Maximum charging capacity: up to 20,000 mAh
• Operating temperature: 0 to 40 C
• Includes: C3400 charger, wall adapter, car adapter, and operating manual

Design and usability

The backlit LCD keeps information legible in dim environments, while the four channel layout helps you stay organized during long sessions. This makes it practical for both individual use and small operations where multiple batteries are handled quickly and safely. While the BT-C3400 provides powerful testing and conditioning capabilities, outcomes will vary with battery history and condition, so approach results as informative rather than guaranteed outcomes.