Product Description

The LiitoKala Lii-M4 is a versatile 4-slot smart battery charger designed for users who need reliable charging, capacity testing, and real-time monitoring of multiple battery types. Compatible with Li-ion, Ni-MH, and Ni-Cd cells, it supports popular sizes including 18650, 21700, 26650, AA, and AAA.

Equipped with a clear LCD display, independent channels, and USB Type-C input, the Lii-M4 offers convenient everyday charging as well as accurate capacity measurement through its TEST mode. This model also includes a USB output function for powering small devices when needed.

Ideal for hobbyists, flashlight users, power-tool enthusiasts, DIY battery pack builders, and anyone who requires dependable multi-format battery charging.

Key Features

Universal Compatibility
Supports Li-ion (3.7V) and Ni-MH / Ni-Cd rechargeable batteries across multiple sizes: 26650, 18650, 21700, 14500, AA, AAA and more.

Smart Charging Modes
Includes CHARGE mode for regular charging and TEST mode for full capacity testing through a charge-discharge-charge cycle.

Independent 4 Slots
Each slot operates independently, allowing different battery types, capacities, and currents to be used simultaneously.

Selectable Charging Currents
Choose between 500mA or 1000mA for Li-ion batteries. Ni-MH/Ni-Cd charge at 500mA.

Clear LCD Display
Shows voltage (V), current (mA), time (h), measured capacity (mAh), power percentage, operating mode, and channel status.

USB Output Port
Provides a standard 5V/1A USB output for powering small electronics.

Comprehensive Protection System
Built-in safety functions include overcharge protection, discharge protection, short-circuit detection, reverse polarity protection, 0V activation, and bad-battery recognition.

Easy Operation
Four physical keys allow quick access to channel selection, mode switching, and current adjustment. Backlight turns on with any key press.

Technical Specifications

Model: Lii-M4
Brand: LiitoKala
Input: Type-C, 5V
Output Current (Charging): 500mA / 1000mA
USB Output: 5V / 1A
Supported Battery Types:
• Li-ion 3.7V (e.g., 18650 / 21700 / 26650 / 14500 etc.)
• Ni-MH / Ni-Cd (AA / AAA)

Working Modes:
• CHARGE
• TEST (Capacity Test: Charge → Discharge → Charge)

Display: LCD (voltage, current, capacity, time, percentage, mode)

Safety Protections:
Overcharge, over-discharge, short-circuit, reverse polarity, intelligent battery detection, 0V activation, 1.65V–2.2V non-charging protection

Test Mode: Automatic 3-step sequence (full charge → discharge → full charge)

How to Use

Mode Selection (MODE Button)
Long-press to switch between CHARGE and TEST modes. After selecting a mode, wait 8 seconds to enter operating state.

Channel Selection (1-2 / 3-4 Keys)
Press repeatedly to view real-time data for each slot: voltage, current, capacity, time.

Current Selection (CURRENT Button)
Choose charging current (500mA or 1000mA depending on battery type). Long-press to control LCD backlight.

Package Includes

• 1 × LiitoKala Lii-M4 Smart Charger
• User Manual

Why Choose This Charger?

The Lii-M4 is a dependable all-in-one charging and battery-testing solution, offering broad compatibility, strong protection features, precise capacity measurement, and intuitive operation—perfect for both beginners and advanced users needing accurate battery diagnostics.