Key features and benefits - Automatic charging restart: When the battery voltage drops below 4.1 V, the charging cycle restarts automatically, helping to maintain a ready-to-use state without manual intervention. - Prevents idle discharge: If the load current remains continuously below 50 mA, the output is switched off to reduce unnecessary power consumption and preserve charge. - Safe and automatic cycle end: After the battery reaches the final floating charging voltage, the charging cycle ends automatically when the charging current falls to 100 mA, providing a clear and controlled termination. - Simple external control of 5V output: An external key connected to the K terminal and the negative output pole lets you control the power indicator and the 5V output with a single interface. Why this matters - Reliable battery management: The device manages charging cycles based on voltage and current thresholds, reducing manual oversight and improving battery longevity. - Energy efficiency: Auto-off during low-load conditions minimizes wasted power and helps extend the usable life of the system. - Easy on/off control: The external key offers a straightforward way to enable or disable the 5V output and indicator, streamlining integration with other hardware. - Minimal wiring complexity: Control is achieved via the K and negative output connection, simplifying installation in existing projects. What to expect - Function: Core charging cycle management with automatic restart, idle protection, and controlled end of charge. - Compatibility: Designed to work with a 5V output and external key control connected to K and the negative output pole. - Performance: Clear thresholds for restart (4.1 V), idle shutdown (50 mA), and end-of-charge current (100 mA) ensure predictable behavior. - Interface: External key provides direct on/off control of the power indicator and 5V output. Usage scenarios - Small electronics project with intermittent load: Use the device to keep a Li-ion battery charged and ready, while shutting off the output when the external load is inactive to save energy. - DIY power supply with manual control: Integrate the external key to turn the 5V output on or off as needed, without disconnecting the battery or altering the charger circuit. - Battery-powered prototype testing: Monitor and manage charging cycles automatically, allowing quick cycling between charging and standby states while maintaining a simple control interface. Technical notes - Battery voltage threshold for restart: 4.1 V - Output shutdown condition: Load current below 50 mA - End-of-charge condition: Charging current drops to 100 mA after reaching the final floating voltage - External control: Key connected to K and negative output pole; single press turns on the power indicator and 5V output; double press turns off both This description preserves the original functions and wiring approach while presenting the information in a clear, customer-focused format with practical usage guidance.