Feature Highlights: 1. Smart Auto Shut-Off – When the continuous load current drops below 50mA, the output automatically turns off to save power. 2. Easy External Control – Connect an external key between the K point and output negative pole. A single short press turns on the power display and 5V output; two quick presses turn both off. 3. Safe Charging Management – Charging stops automatically when the current falls to 100mA after reaching full voltage. If battery voltage drops below 4.1V, charging restarts. For deeply drained batteries (below 2.8V), a gentle 180mA pre-charge is applied first. 4. Type-C Input & High Accuracy – Features a Type-C port with precise charging voltage control and supports charging while discharging (note: adjust charging voltage only when powered off). 5. Stable Boost Output – Provides a steady 5V–5.15V output with line-loss compensation, capable of delivering up to 2A current with 92.5% conversion efficiency and low ripple (100mV). Product Details: This integrated 5V 2A charge-discharge module is built for DIY enthusiasts and practical power solutions. It combines reliable charging control with a boost converter in one compact board. With Type-C input, it accurately manages lithium battery charging—automatically starting and stopping based on voltage and current—while allowing simultaneous charging and discharging. The boost circuit delivers stable 5V output even under load, and the external key option adds simple manual control. Ideal for portable device projects, backup power setups, or custom charger applications. Specifications: - Input Voltage: 5V–5.5V - Charging Cut-off Voltage: 4.2V or 4.35V (±0.5%) - Charging Current: 2.4A (±5%) - Boost Output: 5V–5.15V (adjustable with compensation) - Max Boost Output Current: 2A - Boost Efficiency: 92.5% (3.6V input, 5V 2A output) - Battery Static Current: