Key benefits - Ensures charging resumes automatically when battery voltage drops below 4.1V, maintaining readiness without manual intervention. - Improves efficiency by turning off the 5V output when the load current remains continuously below 50 mA, reducing idle power draw. - Supports a simple external control with a key connected to the K terminal and the negative output pole; a short press turns on the power indicator and enables the 5V output, while a second short press turns off both. - Automatically ends the charging cycle when the charging current drops to 100 mA after reaching the final float charging voltage, providing a straightforward, autonomous charge conclusion. What it does - Battery voltage driven cycling: The charging cycle restarts automatically when the battery voltage falls below 4.1V. - Low current shutdown: If the load current stays below 50 mA, the output is switched off to save power. - External key control: An external key connected to K and the negative output pole controls power and the 5V output. Short press to turn on, short press again to turn off. - Auto end of charge: After reaching the final floating charging voltage, the charging cycle ends automatically when the charging current falls to 100 mA. How to use - External key connection: Connect the external key between the K terminal and the negative output pole. - Turning on: Short press the external key to activate the power indicator and enable the 5V output. - Turning off: Short press the external key again to deactivate the power indicator and disable the 5V output. - Charging cycle behavior: The system will restart charging if the battery voltage drops below 4.1V and will end the cycle automatically when the current falls to 100 mA after reaching the float voltage. - Low load condition: If the connected load draws less than 50 mA continuously, the output will be switched off automatically to conserve energy. Applications and scenarios - DIY electronics projects requiring a controllable 5V output with automatic charge management. The external key provides simple manual control while the system handles restarts and cycle end automatically. - Portable battery packs or power supplies that need to conserve energy when idle. The low-current cutoff ensures the 5V output is off when not in use. - Charging stations or compact power modules used with microcontroller-based systems, where a float charging stage and automatic cycle termination improve reliability and reduce the need for manual monitoring. Key features and attributes - Function: Automatic charge cycle management with automatic restart below 4.1V, low-load output shutdown, external key control, and automatic end at 100 mA after float voltage. - Compatibility: External key compatible; supports a key connected to the K terminal and the negative output pole; provides a 5V output when enabled. - Output: 5V output controlled via external key. - Performance: Responsive to voltage and current thresholds to manage charging cycles and power usage automatically. - Control interface: External key for on/off control with single and double press actions. Technical notes - The charging cycle restarts when battery voltage falls below 4.1V. - The output is switched off if the load current remains continuously below 50 mA. - External control is provided via a key connected to K and the negative output pole; short press enables, short press again disables. - The charging cycle ends automatically when the charging current drops to 100 mA after reaching the final float voltage. Use cases summarized - Simple on/off control of a 5V output for hobbyist or prototyping projects, with autonomous charge management. - Energy-efficient operation for low-draw devices by cutting the output when idle. - Easy integration with external control hardware using a single tactile switch connected to K and the negative output pole.