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2S/3S USB Type-C QC Fast Charging Module for 3.7V Lithium Battery Pack
2S/3S USB Type-C QC Fast Charging Module for 3.7V Lithium Battery Pack
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The 2S/3S USB Type-C lithium battery charging module is designed to charge series-connected 3.7V lithium-ion or lithium-polymer battery packs. It supports both 2S and 3S configurations, making it suitable for 7.4V and 11.1V nominal battery packs.
The module accepts charging power through its USB Type-C port or the VIN and GND soldering terminals. When connected to a compatible QC power adapter, it supports QC fast-charging input and provides up to approximately 15W synchronous boost charging.
It includes charging-status indicator LEDs and adjustable soldering points for charging current, charging voltage and timeout settings. The BM terminal supports cell balancing in 2S mode. The board is normally supplied in a specific 2S or 3S configuration, so the board setting must be checked before connecting the battery pack.
This charging board is suitable for DIY rechargeable battery packs, portable electronics, robotics, backup power projects, speaker battery packs and custom lithium charging systems.
Important: This is primarily a lithium battery charging module, not a complete battery protection BMS. Use a suitable 2S or 3S protection board with the battery pack for overcharge, over-discharge, overcurrent and short-circuit protection.
Specifications
| Specification | Details |
|---|---|
| Product type | Lithium battery boost fast-charging module |
| Supported configuration | 2S or 3S |
| Supported cell voltage | 3.7V nominal, 4.2V fully charged per cell |
| 2S battery voltage | 7.4V nominal, 8.4V fully charged |
| 3S battery voltage | 11.1V nominal, 12.6V fully charged |
| Input interface | USB Type-C and VIN/GND solder pads |
| Standard input source | 5V USB power supply |
| Fast-charging support | QC fast-charge protocol |
| Maximum charging power | Approximately 15W |
| Charging method | Synchronous boost charging |
| Charging efficiency | Up to approximately 94% |
| Default charging current | Depends on onboard resistor configuration |
| Adjustable current | Supported through RISET resistor |
| Battery terminals | B+ and B− |
| Balance terminal | BM terminal for 2S balancing |
| Temperature terminal | NTC connection point |
| Status indicators | Charging, full-charge and fault LEDs |
| PCB colour | Black |
| Approximate dimensions | 31 × 18 × 6.9mm, excluding connector |
| Suitable battery chemistry | Ternary lithium-ion and lithium-polymer |
| Package quantity | 1 piece |
The published technical guide lists approximately 31 × 18 × 6.9mm dimensions, QC input, up to 15W charging power and up to 94% efficiency.
Connection Notes
For 2S mode, connect two 3.7V cells in series and connect the BM terminal to the midpoint between the cells. For 3S mode, the board must be configured correctly for three cells; the BM terminal is not used for balancing in the documented 3S configuration.
Always confirm the board’s 2S or 3S setting before connecting the batteries. Incorrect configuration or reverse-polarity wiring may damage the board or cells.
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