Battery Charger Module for 3.7V Lithium Cells A compact ABS module designed to charge and protect singlecell 3.7V lithium batteries. Provides adjustable regulated output and builtin battery protection to simplify charging setups and small DIY projects. Key benefits Fast charging capability: Supports up to 1A charging current with output currents of 5V 1.4A, 9V 0.8A, and 12V 0.6A for rapid device charging when used as a power supply. Versatile input and adjustable output: Accepts 4.5V to 8V DC input and provides a default 5V output that is adjustable from 4.3V to 27V to match different charging or powering needs. Battery protection and longevity: Builtin overcharge cutoff at 4.2V and overdischarge protection at 2V to help maintain battery health and reduce risk of damage. Durable, easy to integrate: Housings and mounting components made of ABS for a balance of strength and low weight. Technical specifications Item type: Battery Charger Module Material: ABS Input voltage: 4.5V to 8V DC Maximum charging current: 1A Output voltage: Default 5V, adjustable from 4.3V to 27V DC Output current: 5V 1.4A, 9V 0.8A, 12V 0.6A Applicable battery voltage: Singlecell lithium battery 3.7V Overcharge voltage: 4.2V Overdischarge voltage: 2V Package contents 1 x Battery Charger Module 1 x Manual Practical applications Portable power packs: Build or maintain singlecell Liion power banks with adjustable regulated output for charging phones or USB devices. Solar charging systems: Integrate with small solar panels within the 4.5V to 8V input range to regulate and protect a 3.7V lithium battery in offgrid or outdoor setups. Electronics projects and repairs: Use as a bench charger or adjustable power module when testing circuits, powering sensors, or refurbishing batteryoperated devices. Usage notes Ensure input source voltage stays within 4.5V to 8V DC. Confirm the battery is a compatible single 3.7V lithium cell and observe correct polarity when connecting. For charging, set appropriate output voltage and limit current as needed. Maximum charging current is 1A. Follow the included manual for wiring and setup instructions. This module provides a practical combination of adjustable output, charging speed, and basic battery protection for hobbyist and smallscale applications.