USB 5V Step-Up Booster - Lithium Battery Charging and Protection Module for Power Bank

USB 5V Step-Up Booster – Lithium Battery Charging & Protection Module (DIY Power Bank)

This compact and efficient module is the perfect core component for building a DIY Power Bank or portable 5V power supply. It combines battery charging, voltage boosting, and protection circuitry into a single board designed for use with one 3.7V Lithium-Ion or Lithium-Polymer battery such as an 18650 cell.

During charging, the module accepts a standard 5V input via the Micro-USB port and safely charges the battery using a CC/CV (Constant Current / Constant Voltage) algorithm, terminating precisely at 4.2V. During discharge, the integrated step-up (boost) converter efficiently raises the battery voltage (2.5V–4.2V) to a stable 5V USB output, capable of delivering up to 1A–1.2A with efficiency exceeding 85%.

Comprehensive safety protections are built in, including over-charge, over-discharge (2.9V cutoff), over-current, and short-circuit protection. The module also features ultra-low standby current (≤8µA), ensuring excellent battery preservation when no load is connected.

🔧 Key Features

• All-in-One Design: Integrated charger, booster, and protection circuit
• Charging Input: Micro-USB (5V DC)
• Charging Method: CC/CV with 4.2V charge termination
• Boost Output: Stable 5V via USB Type-A female port
• Output Current: Up to 1A–1.2A
• High Efficiency: ≥85% step-up conversion efficiency
• Battery Protection: Over-charge, over-discharge, over-current, and short-circuit protection
• Low Standby Power: ≤8µA quiescent current

💡 Applications

• DIY Power Banks using 18650 or Li-Po batteries
• Portable 5V power supply for Arduino, ESP32, Raspberry Pi
• Solar-powered USB charging systems
• Battery backup solutions for portable electronics
• Educational and hobby electronics projects

⚙️ Technical Specifications

📦 Package Includes

• 1 × USB 5V Step-Up Booster / Power Bank Module