The MH-CD42 module is a popular DIY power bank control board designed for single-cell (1S) 3.7V lithium batteries, such as 18650 Li-ion cells. It integrates a battery charging circuit (up to 4.2V) and a DC-DC boost converter that steps the battery voltage up to a stable 5V output for powering USB devices.
This module is widely used in DIY power bank builds, portable chargers, backup power supplies, and battery-powered electronics. The MH-CD42 allows simultaneous battery charging and load output, making it practical for real-world applications.
It supports USB output and is optimized for compact, low-cost power solutions using standard lithium cells.
Key Features
Designed for 1S 3.7V lithium batteries (18650 recommended)
Battery charging voltage: 4.2V
Boosts battery voltage to 5V output
Integrated charging + boost circuit
Suitable for DIY power bank projects
Simple wiring and easy integration
Compact and lightweight PCB
Specifications
Battery Type: 1S Li-ion / Li-Po
Nominal Battery Voltage: 3.7V
Charging Voltage: 4.2V
Output Voltage: 5V
Application: Power bank / portable power supply
Typical Use Battery: 18650
Applications
DIY power bank
Portable USB charger
Battery backup projects
Embedded power solutions
DIY electronics & hobby projects
Package Includes
1 × MH-CD42 Power Bank Module
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