5V 2.1A Dual USB DC-DC Boost Converter Step-Up Charging Module for 18650 Lithium Battery Power Bank

Overview

The 5V 1A / 2.1A Dual USB Boost Converter Board is an all-in-one charging and voltage step-up solution for 3.7V Lithium-Ion (18650) or Li-Po battery packs. It eliminates the need for separate charging (like TP4056) and boosting circuits.

Simply connect a 3.7V battery to the dedicated B+ and B- pads, and the board will automatically step up the voltage to a stable 5V DC. It features dual USB output ports, allowing you to power microcontrollers, charge smartphones, or run 5V project hardware efficiently. An integrated Micro-USB/Type-C input allows you to recharge the connected batteries using a standard mobile charger easily.

Key Features

• Dual Output Capacity: Includes two standard USB Type-A ports capable of delivering 1A and 2.1A simultaneously.

• Smart Charge & Discharge: Safely steps up 3.7V battery voltage to 5V while safely regulating incoming power during battery recharging.

• LED Status Indicators: 4-stage onboard LED display (25\%, 50\%, 75\%, 100\%) gives you real-time battery level visibility.

• Integrated Safety Features: Built-in over-charge protection, over-discharge protection, and short-circuit control to keep your lithium cells healthy.

• Compact Footprint: Ultra-slim profile, designed to fit cleanly inside custom 3D-printed power bank enclosures or compact project boxes.

Technical Specifications

Wiring Instructions

• B+ Pin: Must be connected to the Positive terminal of the 3.7V Lithium battery.

• B- Pin: Must be connected to the Negative terminal of the 3.7V Lithium battery.

• Warning: Reverse polarity (connecting B+ to negative or B- to positive) will instantly burn out the main management IC. Double-check your connections before powering up!