【Product Description】
The Ultimate 4-in-1 Smart Charger Kit with High-Capacity 21700 Batteries!
We have combined the advanced LiitoKala Lii-M4S 4-Slot Smart Charger with 2x 21700 5000mAh Li-ion batteries into one perfect bundle. Whether you're a flashlight enthusiast, a DIY battery pack builder, or simply need reliable power for your household devices, this kit has you covered.
The Lii-M4S features an upgraded touch control interface and 4 intelligent modes:
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CHARGE Mode: Smartly identifies battery type and fully charges with auto-stop safety.
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DISCHARGE Mode: Eliminates battery memory effect and maintains battery health.
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TEST Mode: Measures the real mAh capacity of your batteries, helping you identify fake or degraded cells.
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STORAGE Mode: Automatically adjusts the battery voltage to an ideal 3.7V for long-term storage, extending battery lifespan.
The Slot 4 USB output even lets you use a charged 21700 battery as an emergency power bank for your phone. Paired with 2x 21700 5000mAh batteries (available in Flat Top or Button Top), this bundle is the ultimate power solution for extended outdoor trips, emergency preparedness, and heavy-duty applications.
( IMPORTANT: Please select your preferred variant. Choose between Flat Top (70.9mm) or Button Top (72mm) batteries. Button Top adds ~1mm length. Also select your preferred plug type: No Adapter, US Plug, EU Plug, or UK Plug. Please check your device's battery bay depth before ordering!)
【Key Features】
Charger: LiitoKala Lii-M4S
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4 Intelligent Modes: Charge, Discharge, Capacity Test (TEST), and Storage Mode (maintains battery at 3.7V for long-term storage).
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Upgraded Touch Control: Sensitive touch buttons replace traditional mechanical switches for a modern, durable, and easy-to-use interface.
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Built-in USB Output (Slot 4): Insert a charged 3.7V Li-ion battery into slot 4 and use it as an emergency power bank for your phone!
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4-Slot Independent Control: Charge up to four different batteries simultaneously with independent monitoring.
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High-Definition LCD Display: Real-time display of battery voltage, current, capacity, elapsed time, and working mode for all 4 slots.
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Adjustable Current (0.3A/0.5A/0.7A/1.0A): Multiple current options to match different battery sizes and capacities.
Battery: 21700 5000mAh
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Massive 5000mAh Capacity: Delivers extended runtimes for high-lumen flashlights and power-hungry devices.
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Stable 10A Continuous Discharge: Provides reliable power without excessive voltage sag.
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Ultra-Long 1000 Cycle Life: Withstands over 1000 charge/discharge cycles with only 50% capacity degradation.
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Available in Flat Top & Button Top: Choose the terminal that fits your specific device. Flat Top (70.9mm) or Button Top (72mm).
【Parameters & Specifications】
Charger (LiitoKala Lii-M4S)
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Brand: LiitoKala
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Model: Lii-M4S
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Input: USB Type-C (5V / 2A)
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USB Output: 5V / 1A (Slot 4, Power Bank Function)
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Output Current: 0.3A × 4 / 0.5A × 4 / 0.7A × 2 / 1.0A × 2 (Adjustable)
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Compatible Chemistries: 3.7V Li-ion, 1.2V NiMH
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Compatible Sizes: 18650, 21700, 26650, 16340, AA, AAA, and more
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Display: LCD Screen with Touch Control
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Safety Features: 6-layer protection (over-discharge, over-temperature, over-voltage, over-charge, short circuit, over-current)
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Dimensions: 146mm × 100mm × 33mm
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Weight: Approx. 250g
Battery (21700 5000mAh)
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Brand: LiitoKala
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Model: Lii-50E
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Battery Size: 21700
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Nominal Capacity: 5000mAh (Minimum 4800mAh)
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Nominal Voltage: 3.7V
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Full Charge Voltage: 4.2V
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Discharge Cut-off Voltage: 2.75V
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Max Continuous Discharge Current: 10A
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Internal Resistance: ≤20mΩ
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Cycle Life: 1000 cycles (50% capacity retention)
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Terminal Options: Flat Top (70.9mm) / Button Top (72mm)
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Weight: Approx. 67g (per battery)
【Applications】
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High-Lumen Flashlights: Powers tactical and everyday carry flashlights.
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Emergency Power Bank: Use a charged 21700 in Slot 4 as a backup power source for your phone.
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Professional Battery Testing: Use TEST mode to measure real capacity and identify fake or degraded cells.
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Long-Term Storage: Use STORAGE mode to prepare batteries for seasonal storage, extending their lifespan.
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DIY & Electronics: Perfect for charging batteries for custom battery packs and electronics projects.
【Frequently Asked Questions (FAQ)】
Q1: What is the difference between Flat Top and Button Top?
A1: Flat Top (70.9mm) is the standard version for most modern devices. Button Top (72mm) has a raised terminal for older spring-loaded devices and adds ~1mm length. Please measure your device's battery bay before ordering!
Q2: Does the charger come with a wall adapter?
A2: It depends on the variant you choose. The "No Adapter" variant includes the charger and Type-C cable only. The "US/EU/UK Plug" variants additionally include the corresponding wall adapter. Please select carefully.
Q3: How does the Power Bank function work?
A3: Insert a charged 3.7V Li-ion battery into slot 4, then plug your phone or USB device into the USB output port on the side. The charger will use the battery's energy to charge your device.
Q4: What is STORAGE mode?
A4: STORAGE mode automatically adjusts the battery voltage to an ideal 3.7V for long-term storage. This helps extend battery lifespan and maintains health during periods of non-use.
Q5: Can I charge different types of batteries at the same time?
A5: Yes! The Lii-M4S features 4 independent slots with automatic identification. You can charge a 3.7V Li-ion battery in slot 1 and a 1.2V NiMH battery in slot 2 simultaneously.
