18650 2-Slot Li-Ion Smart Battery Charger

Keep your high-drain devices and tactical gear powered up with the 18650 2-Slot Li-Ion Smart Battery Charger. Designed for safe, fast, and independent dual-bay charging, this intelligent charger accommodates two 3.7V cylindrical lithium-ion cells simultaneously, regulating voltage and current for each slot separately.

Powered via a standard 5V USB interface, it operates without bulky wall transformers—simply connect it to any USB wall plug, computer port, power bank, or car adapter. High-tension sliding rails, clear LED status indicators, and integrated multi-layer electrical protections make it a reliable charging hub for tactical flashlights, headlamps, smart doorbells, and hobby electronics.

Key Features & Specifications

• Product Type: Dual-Slot USB Smart Li-Ion Battery Charger.

• Dual Independent Charging Channels:

  • Charge 1 or 2 batteries independently at the same time.

  • Mix different battery sizes, charge levels, or capacities across the two bays without interference.

• Intelligent Microprocessor Management:

  • Uses automated Constant Current / Constant Voltage (CC/CV) charging curves to optimize battery health and maximize lifespan.

  • Automatically detects cell readiness and terminates charge at ~4.2V to prevent overcharging.

• LED Status Indicators:

  • Independent LED lights for each slot show charge progress at a glance (e.g., Red while charging, Green upon full charge or standby).

• Comprehensive Multi-Safety Suite:

  • Overcharge Protection: Auto-cutoff prevents over-voltage damage.

  • Reverse Polarity Protection: Protects cells and circuitry if a battery is inserted backward.

  • Short-Circuit Protection: Shuts down power delivery if an electrical fault or short is detected.

  • Over-Current & Over-Voltage Protection: Shields batteries from input power fluctuations.

  • Heat Dissipation Design: Built-in ventilation slots keep operating temperatures cool and stable.

• Universal 5V USB Bus-Powered:

  • Standard Micro-USB or USB Type-C input port.

  • Compatible with phone charging adapters, PC towers, laptops, USB power strips, and portable battery banks.

• Spring-Loaded Slider Bays: Durable stainless steel slide rails adjust smoothly to firmly fit both flat-top and button-top cylindrical cells.

• Broad Battery Compatibility:

  • Primary Size: Fully optimized for 18650 3.6V / 3.7V Li-ion cells.

  • Other Compatible Cylindrical Sizes: Also fits 26650, 21700 (unprotected), 20700, 18500, 18350, 17670, 16340 (RCR123A), 14500, and 10440.

Charging Tip: For the fastest and most stable charge rates across both slots simultaneously, plug the charger into a 5V/2A (or higher) USB wall adapter.