2A Lithium Battery Charging Buck Converter Board (DC-DC step-down charger module)

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Lithium Battery Charging Buck Converter Board (DC-DC step-down charger module). It is commonly used for charging  3S lithium batteries from a higher DC voltage source like solar panels or adapters. Parameter Specification Input Voltage 6V – 24V DC Output Battery Options  12.6V Charging Current Up to 2A Battery Type Li-...

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Lithium Battery Charging Buck Converter Board (DC-DC step-down charger module). It is commonly used for charging  3S lithium batteries from a higher DC voltage source like solar panels or adapters.

Parameter Specification
Input Voltage 6V – 24V DC
Output Battery Options  12.6V
Charging Current Up to 2A
Battery Type Li-ion / Lithium batteries
Conversion Type Synchronous Rectification Buck Converter
Efficiency Up to 95%
Protection Over-current, short-circuit, thermal
Charging Method CC/CV (Constant Current / Constant Voltage)
Heat Generation Low heat design
Module Type DC-DC Step-down Charger

Usage Points

1. Lithium Battery Charging

  • Charges 18650 lithium cells safely
  • Supports:
    • 1S (4.2V)
    • 2S (8.4V)
    • 3S (12.6V)

2. Solar Charging Projects

  • Can directly charge lithium batteries from solar panels
  • Common in:
    • Solar lights
    • DIY solar power banks
    • Portable energy systems

3. Arduino / ESP32 Battery Backup

  • Used in IoT projects for rechargeable battery systems
  • Keeps batteries charged while powering electronics

4. Automotive & Portable Devices

  • Suitable for:
    • Dashcams
    • Portable speakers
    • Mini UPS systems
    • Emergency lights

5. DIY Power Bank Systems

  • Used to build custom rechargeable packs
  • Can charge battery packs from adapters or solar panels

Important Notes

  • Use the correct version:
    • 4.2V for 1 battery
    • 8.4V for 2 batteries in series
    • 12.6V for 3 batteries in series
  • Do NOT exceed input voltage limit
  • Use proper lithium BMS protection for battery safety
  • Ensure correct polarity connection

Advantages

  • High efficiency
  • Compact size
  • Low heating
  • Stable charging
  • Good for embedded projects
  • Simple wiring

Typical Applications

  • Solar battery charging
  • LED emergency lights
  • Portable electronics
  • DIY UPS
  • Robotics
  • Wireless sensor nodes
  • Battery-powered displays

 

 

 

 

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