Type-C USB 3.7V 4.2V 1A 5W Lithium Li-ion 18650 Battery Charger Board

3.7V Lithium Battery Charging & Boost Module – Adjustable DC Output

High-performance lithium battery charging and boost converter module suitable for DIY electronics, power banks, portable devices, IoT projects, and embedded systems.

Product Features:
• Up to 1A programmable linear charging current
• Designed for single-cell 3.7V lithium batteries
• 4.2V full charge voltage
• Constant current / constant voltage charging
• Over-temperature protection
• Soft start function to limit inrush current
• Reverse battery protection
• Low standby power consumption
• Charging, full-charge, and fault status indicators
• Supports 0V battery activation and 2.9V trickle charging
• Operating temperature: -40°C to 80°C

Specifications:
• Input Voltage: 4.2V – 6.5V
• Adjustable Output Voltage: 4.2V – 28V
• Maximum Output Power: 5W
• Charging Current: Adjustable up to 1A
• Supports Type-C input and solder pad input
• Compatible with 18650 and polymer lithium batteries

Charging Indicator:
• Red LED (CHRG): Charging
• Blue LED (STDBY): Fully charged / standby
• Indicator status may vary during boost output operation

Charging Current Setting:
Charging current can be adjusted by changing the resistor value.

Resistance (KΩ) : 30 | 5 | 2 | 1.2
Charge Current (mA): 50 | 250 | 580 | 1000

Usage Notes:
• Use with 3.7V lithium batteries only
• Batteries with protection boards can use standard package
• Batteries without protection boards should use discharge-protection version
• Output voltage adjustable using onboard potentiometer

Suitable for:
• DIY Power Banks
• Portable Electronics
• Arduino & ESP Projects
• Battery Charging Applications
• IoT Devices