The Mini 5V Step-Up Power Bank Module is an ultra-compact, two-in-one solution for portable power. At Electrapac, we recommend this board for hobbyists who need a tiny, lightweight way to add a rechargeable 5V USB output to their projects without the bulk of a full-sized power bank.

Product Overview

This module is the "miniature hero" of power management. It combines a Lithium Battery Charger and a DC-DC Step-Up (Boost) Converter on a single PCB roughly the size of a fingernail. It takes the 3.7V from a single 18650 or Li-Po battery and boosts it to a stable 5V output, while also providing a Micro-USB port to recharge the battery.

Key Features for Electrapac Customers

• Ultra-Miniature Design: Its small footprint makes it perfect for "stealth" installs inside small toys, 3D-printed gadgets, or handheld devices.

• Charge & Boost Simultaneously: While you are charging the battery via Micro-USB, the module can still provide power to your 5V circuit (Note: output current is shared).

• Integrated Protection IC: Features built-in over-charge and over-discharge protection, ensuring your Electrapac lithium cells stay healthy and don't drain past the danger zone.

• Dual-Color Status LED:

  • Red LED: Charging in progress.

  • Green/Blue LED: Charging complete.

• High Efficiency: Uses synchronous rectification to achieve up to 90% efficiency, reducing heat and maximizing battery runtime.

Wiring & Setup Guide

Follow these simple terminal points to build your Electrapac mini-power source:

1. B+ (Battery Positive): Connect to the (+) of your 3.7V Lithium battery.

2. B- (Battery Negative): Connect to the (-) of your battery.

3. VOUT+ (Output): Provides regulated 5V for your project.

4. GND (Ground): The common negative for your 5V output.

Important: This module does not have a full-sized USB-A female port. It uses solder pads for the output, allowing you to wire it directly to your circuit or solder your own USB socket as needed.

Primary Applications

• Portable Arduino Power: Powering an Arduino Nano or Pro Micro from a single 18650 cell.

• DIY Pocket Fans: A tiny driver for small 5V DC motors.

• USB Emergency Chargers: Building the smallest possible backup charger for low-power accessories.

• LED Wearables: Powering WS2812B (Neopixel) LED strips on clothing or cosplay.

• Wireless Sensors: Providing a rechargeable 5V rail for ESP8266 or ESP32 IoT nodes.

Why Shop at Electrapac?

We source our Mini Power Modules with high-quality chipsets to ensure the voltage doesn't "sag" when your device draws its full 1A current. At www.electrapac.com, we provide the compact components that let you dream big and build small.