18650 5V Type – C Lithium Battery Charger 3A Module with Battery Box

Specifications

• Product Type: Lithium-ion battery charger module with holder
• Battery Type: 18650 Li-ion (single cell, 3.7 V nominal)
• Charging Method: CC/CV (constant current/constant voltage)

Input

• Input Voltage: 5 V DC
• Input Connector: USB Type-C
• Recommended Input Current: ≥ 2 A (for stable operation)

Charging Characteristics

• Charge Current: up to 3 A (adjustable or fixed depending on model)
• Charge Voltage: 4.2 V ±1%
• Charging Cut-off Current: typically 10% of set current
• Efficiency: high efficiency linear or switching (depends on IC used)

Protection Features

• Overcharge Protection: yes
• Overcurrent Protection: yes
• Short Circuit Protection: yes

Indicators

• Charging Indicator: LED (charging status)
• Full Charge Indicator: LED (battery full)

Battery Holder

• Type: Single 18650 battery holder
• Mounting: onboard holder or external battery box with leads
• Contact Type: spring or clip

Output

• Output Voltage: 4.2 V (battery voltage)
• Output Current: depends on load and battery condition

Electrical Characteristics

• Battery Protection IC: integrated (in some versions)
• Charging Controller IC: commonly based on TP4056 or equivalent (for lower current versions)
• High-current versions may use switching charger ICs

Mechanical Characteristics

• PCB Size: approximately 25 mm × 20 mm to 30 mm × 25 mm (varies)
• Connector Type: Type-C port mounted on PCB

Environmental

• Operating Temperature: 0°C to +45°C (charging recommended range)
• Storage Temperature: -20°C to +60°C

Applications

• Portable electronics
• DIY power banks
• IoT and embedded systems
• Battery-powered projects

Performance

• Stable charging with CC/CV profile
• Compact design with integrated battery holder
• Convenient Type-C input for modern power sources

Important Notes

• Use only 3.7 V 18650 lithium-ion batteries
• Ensure correct battery polarity before insertion
• Heat dissipation is important at higher charge currents (near 3 A)
• Not all modules support true 3 A charging continuously
• Do not short battery terminals
• Use a quality 5 V power supply for stable charging