1. Built-in Charge and Discharge: The module is capable of both charging the connected lithium battery and discharging to power external devices.

2. Charge Status Indication: The board has an LED indicator that flashes red while charging and stays solid red when the battery is fully charged.

3. Multiple Battery Connection: You can connect multiple lithium batteries in parallel, as long as their voltage ranges from 3.7V to 4.2V. Note that the batteries should only be connected in parallel and not in series.

4. Protection Functions: The module includes protection mechanisms to prevent over-charge, over-discharge, and over-load situations. This protection ensures the safety and longevity of the connected batteries and devices.

USB Power Bank Module specifications:

1. Input Voltage: Supports a range from 3.7V to 5.5V, making it suitable for various power sources.

2. Charging Current: Capable of providing a maximum charging current of 1A.

3. Output Current: Can deliver a maximum output current of 1A.

4. Output Voltage: Provides a stable 5V output voltage for charging external devices.

5. BAT Discharging Stop Voltage: Automatically stops discharging when the battery voltage drops to 2.9V, protecting the battery from over-discharge.

6. Discharging Efficiency: Achieves an efficiency of approximately 85% when the input voltage is 3.7V and the output current is 5V/1A.

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• USB Power Bank Module Tutorial: Building a DIY Power Bank, 18650 Battery Basics, Charging & Boost Conversion, Protection (BMS), Load Sharing, and Arduino/ESP32 Powering
  This tutorial is a detailed, practical guide to using the USB Power Bank Module</strong> (Leobot Product #12659) to build a DIY rechargeable USB power source. You’ll learn how power bank modules typically work internally (battery charging + protection + 5V boost), how to connect an 18650 cell safely, what to expect from capacity claims, how to power Arduino/ESP32 projects reliably, and the real-world pitfalls: undervoltage cutoffs, inrush resets, “why it turns off at low load”, pass-through charging limits, and how to choose the right battery and wiring for stable output.