Dual USB 5V Power Bank Module with Digital Display | DIY 18650 Mobile Power Boost Module | Lithium Battery Charging & Boost Converter Board

Technical Specifications

• Input Power: 3.7V – 4.2V (Single 18650 Li-ion cell)
• Output Voltage: 5V (Boost Converter)
• Output Ports: Dual USB (USB1 + USB2)
• USB Output Current: 1A / 2.1A (depending on model)
• Charging Input: Micro USB / Type-C (varies by board version)
• Digital Display: Battery Level Indicator
• Battery Type: Supports 18650 Li-ion battery
• Protection Features:
  • Overcharge protection
  • Over-discharge protection
  • Short-circuit protection
  • Overcurrent safety
• Conversion Efficiency: Approx. 90% (depending on load)
• Extra Features:
  • Supports charging and discharging simultaneously
  • SMD high-efficiency components
  • Plug-and-play battery holder (depends on version)
  • Applications: Power banks, DIY portable chargers, smart gadgets, emergency charging systems, Arduino/IoT battery power supplies
    
    

Technical Description

Build your own high-performance portable power bank with this DIY 18650 Mobile Power Boost Module, designed to convert a 3.7V lithium battery into a stable 5V USB output. Featuring dual USB ports, it allows you to charge two devices at the same time—ideal for smartphones, wearables, Bluetooth devices, and IoT gadgets.

The module includes a digital battery level display, ensuring real-time voltage and charge monitoring. Engineered with boost converter technology, it efficiently delivers fast and stable output with up to 90% conversion efficiency.

With built-in overcharge, over-discharge, overcurrent, and short-circuit protection, this module is perfect for DIY enthusiasts, students, and makers building custom power banks, emergency chargers, or battery-powered projects.