Solar Charging Module for 18650 & Polymer Lithium Batteries

Keep your lithium battery projects powered up with this compact Solar Charging Module. Compatible with 3.6V / 3.7V / 4.2V 18650 and polymer lithium battery cells, this SMD-based charging board accepts input from both a Micro USB port and a 3.6V–7V solar panel — making it perfect for off-grid builds, DIY power banks, solar garden lights, and portable electronics projects.

Key Features

Dual Input: Charges via Micro USB (5V) or solar panel (3.6V–7V input range)
Output Voltage: 4.2V, optimized for single-cell 18650 and lithium polymer batteries
Built-in Protection Circuit: Overcharge, over-discharge, and short-circuit protection safeguard your battery and project
Compact SMD Design: Small form factor fits easily into DIY enclosures, breadboards, and custom builds
LED Charging Indicator: Visual status indicator so you always know when charging is in progress or complete
Wide Compatibility: Works with standard 18650 cells and most single-cell lithium polymer (LiPo) packs
Customizable: Suitable for custom project integration — each order includes the SMD charging board

Specifications

Input (USB): 5V via Micro USB
Input (Solar): 3.6V – 7V
Output / Charge Voltage: 4.2V
Battery Compatibility: 3.6V / 3.7V 18650 Li-ion, Lithium Polymer
Includes: SMD charging board with protection module

Ideal For

DIY solar power banks and portable chargers
Solar-powered garden lights and sensors
Maker projects, Arduino, and Raspberry Pi power supplies
Off-grid electronics and remote device charging

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What batteries is this solar charging module compatible with?

A: This solar charging module is designed for single-cell 3.6V / 3.7V 18650 lithium-ion batteries and lithium polymer (LiPo) battery packs with a full charge voltage of 4.2V. It is not suitable for multi-cell battery strings without additional circuitry.

Q: Can I charge using both solar and USB at the same time?

A: The module supports both Micro USB (5V) and solar panel input (3.6V–7V). While it can accept solar energy when USB is not connected, it is generally recommended to use one input source at a time for optimal charging performance and to protect the battery.

Q: Does this module include overcharge or short-circuit protection?

A: Yes — the built-in protection circuit guards against overcharging (above 4.2V), over-discharging, and short circuits, helping to extend the life of your battery and keep your DIY project safe during operation.

Q: What solar panel voltage is required to charge via solar input?

A: The module accepts a solar panel input voltage in the range of 3.6V to 7V. A standard 5V or 6V solar panel is ideal for reliable charging under typical sunlight conditions.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.