USB Fan Speed Controller Board, 5V/7V/9V Modes, USB-C Input, Lithium Battery Charging

Compact fan control board with integrated lithium battery protection and multi-step output voltages. Designed for simple installation and reliable operation in small, battery-powered fan assemblies and DIY electronics. Key benefits and why you need it - Compact footprint and low profile allow installation in tight spaces while preserving functionality. - One-button operation and clear status indication make it easy to use without complex wiring. - Built-in battery management and cutoffs protect the battery from overcharge and overdischarge, reducing risk of damage during normal use. - Low standby current maximizes battery life when the fan is idle. - Multiple output voltage steps provide flexible speed control for different cooling needs. Main features and specifications - Charging input: 5 V with 1 A current limit. - Battery input: 3.0 to 4.2 V; do not exceed 4.2 V. Avoid using a supply with more than 2 A. - Battery protection: 4.2 V charge cutoff with lithium battery management protection. - Battery indicator: blue blinking LED around 3.2 V. - Standby current: approximately 10 uA. - Outputs (speed steps): Step 1 = 5 V, Step 2 = 7 V, Step 3 = 9 V, Step 4 = off. - Maximum output current: must not exceed 0.4 A. - Physical dimensions: 34.43 mm x 27.35 mm. - Button height: 6 mm. - Bezel diameter: approximately 2.5 mm. Compatibility and installation notes - Intended for battery-powered fan or motor modules that accept the listed voltage and current ranges. - Connect battery and motor cables with correct polarity. The connector and wiring may differ from original equipment; confirm compatibility before installation. - Not compatible with handheld plug-style connectors unless wiring is adapted appropriately. Practical applications - Portable cooling modules powered by a single-cell lithium battery for outdoor equipment or instruments. - Small