LiitoKala Lii-M4S Smart 4 Slot Battery Charger

LiitoKala Lii-M4S 4-Slot Multi-Function Smart Battery Charger and Tester

The LiitoKala Lii-M4S is a versatile, high-precision 4-slot smart battery charger and analyzer designed to meet the demands of DIY electronics makers, robotics builders, and power tool enthusiasts in Bangladesh. Operating via a modern USB Type-C 5V/2A input, this intelligent charger accommodates a wide spectrum of cylindrical rechargeable battery chemistry and sizes, including popular 18650, 21700, 26650 Li-ion cells, and standard AA/AAA Ni-MH batteries. Whether you are building an autonomous robot, powering custom IoT devices, or testing battery health for science projects at Biggan Project, the Lii-M4S provides accurate control over charging, discharging, and capacity measurements. Equipped with an interactive touch LCD screen, users in BD can easily monitor real-time metrics across four completely independent channels.

How it works: The Lii-M4S integrates sophisticated micro-controller algorithms that automatically detect battery types (Li-ion 3.7V vs. Ni-MH 1.2V) and apply optimal charging curves. It features four dedicated operational modes: CHARGE, DISCHARGE, TEST, and STORAGE. The unique STORAGE mode automatically charges or discharges 3.7V Li-ion cells to a safe 3.7V nominal level, prolonging battery shelf life during inactive periods. Furthermore, Channel 4 features a built-in USB output port, converting a loaded Li-ion battery into a convenient 5V/1A power bank for emergency device charging. This makes the LiitoKala Lii-M4S an indispensable diagnostic tool for lab work, hobby electronics, and field applications across Bangladesh.

Product Specifications

Features

• Four fully independent channels supporting simultaneous mixed-battery charging and testing.
• Intuitive touch control panel with quick selection points for modes, channels, and currents.
• Comprehensive real-time LCD monitoring showing voltage (V), current (mA), capacity (mAh), time (h), and working mode.
• Dedicated STORAGE mode that automatically conditions Li-ion batteries to 3.7V for long-term safe storage.
• TEST mode cycle (Charge-Discharge-Charge) to accurately measure actual mAh capacity of aged or new batteries.
• Channel 4 emergency USB 5V/1A output function powered by a inserted Li-ion battery.
• Built-in 0V voltage activation function to recover deeply discharged lithium-ion batteries.
• Integrated multi-layer safety protections against short circuits, over-charging, and reverse polarity insertion.

Applications / Use Cases

• Testing and sorting 18650 cells for custom lithium battery pack assemblies in robotics and drone projects.
• Measuring actual capacity of repurposed laptop batteries for DIY power wall and IoT sensor projects in BD.
• Safely storing unused 3.7V Li-ion batteries at optimal storage voltage to prevent capacity degradation over time.
• Recharging high-drain 21700 and 26650 cells used in flashlights, RC vehicles, and portable power equipment.
• Routine maintenance and testing of standard Ni-MH AA/AAA rechargeable batteries for household electronics.

User Guide / How to Use

• Connect the charger to a stable 5V/2A USB power adapter using the provided Type-C cable.
• Insert rechargeable batteries into any slot paying attention to positive (+) and negative (-) orientation.
• Tap the 1-2 or 3-4 channel touch points to select individual slots for setup.
• Long-press the MODE touch button to switch between CHARGE, DISCHARGE, TEST, and STORAGE modes.
• Tap the CURRENT button to select your desired charge rate (300mA, 500mA, 700mA, or 1000mA).
• Allow 8 seconds without input; the charger will automatically start operation on selected channels.
• To use as a power bank, insert a charged Li-ion battery into Channel 4 and connect your device to the USB output port.

Frequently Asked Questions (FAQs)

• Q: Can the LiitoKala Lii-M4S charge LiFePO4 batteries?
  A: No, the Lii-M4S is designed specifically for standard 3.7V/4.2V Li-ion and 1.2V Ni-MH batteries. It does not support LiFePO4 chemistry.
• Q: Can I charge 4 batteries at 1000mA at the same time?
  A: Maximum charging current for 4 channels simultaneously is 500mA per slot. 1000mA and 700mA speeds are available when using up to 2 slots.
• Q: How does the USB output power bank function work?
  A: Insert a high-voltage Li-ion battery into slot 4. The 5V/1A USB port on the charger will activate to power or charge external devices.
• Q: What power adapter should I use with this charger in Bangladesh?
  A: Use a high-quality 5V/2A USB wall adapter or phone charger for reliable performance.

Challenges and Considerations

• Requires a stable 5V/2A power supply; using weak USB ports (like old PC USB ports) may reduce performance or cause reset loops.
• LiFePO4 batteries are strictly unsupported and attempting to charge them could result in battery damage.
• High capacity test cycles in TEST mode take several hours to complete as it conducts a full charge, discharge, and recharge process.

Compatibility

• Cylindrical Li-ion / IMR / INR / ICR: 26650, 21700, 20700, 18650, 18500, 18350, 16340 (RCR123), 14500, 10440.
• Ni-MH / Ni-Cd: AA, AAA, AAAA, C size rechargeable batteries.
• Incompatible with: LiFePO4 batteries, primary non-rechargeable alkaline or heavy-duty dry cells.

Future Enhancement Options

• Integration with custom 3D-printed battery holder docks for rapid testing of non-standard cell tabs.
• Pairing with a dedicated 5V/3A high-efficiency power supply unit to maintain maximum load stability.
• Using temperature sensor logging probes alongside the charger during high-rate discharge tests for advanced cell health logging.

Benefits

• Prevents premature battery failure by providing accurate capacity diagnostics and safe voltage storage.
• Saves workbench space by replacing separate chargers, capacity testers, and power banks with one single unit.
• User-friendly touch interface eliminates mechanical button wear while enabling effortless slot monitoring.
• Cost-effective diagnostic tool essential for DIY electronics, robotics, and battery management projects in Bangladesh.

Conclusion

The LiitoKala Lii-M4S stands out as a reliable, feature-packed smart battery charger and analyzer. With independent channel control, precise capacity testing, storage state management, and power bank capability, it offers exceptional utility for hobbyists, engineers, and makers across Bangladesh. It ensures your rechargeable cells are maintained safely and performing at their absolute best for all your project needs.

LiitoKala Lii-M4S, LiitoKala Lii M4S, LiitoKala LiiM4S, Liito Kala M4S, Lii-M4S, Lii M4S, LiiM4S, M4S charger, Litokala M4S, Litokala Lii M4S, Liitokala battery charger, 18650 charger, 18650 battery charger, 21700 battery charger, 26650 battery charger, smart battery charger, 4 slot battery charger, 4 slot battery tester, battery capacity tester, battery discharge tester, LCD battery charger, touch charger 18650, battery capacity analyzer, 18650 charger bangladesh, litokala charger bd, liitokala original charger, universal battery charger, AA AAA charger, NiMH battery charger, Li-ion battery charger, smart charger with storage mode, lithium ion charger, betari charjar, batari charger, betary charger, 18650 betari charjar, liitokala m4s dam koto, litokala bd, biggan project charger