Product Description Specifically designed for measuring the capacity of 18650 batteries. The integrated charging and discharging design eliminates the tedious process of disassembling and installing batteries; charging and discharging can be completed simply by using the device. Adjustable discharge current for ease of use. Compact size for portability. Stable performance. This product is an 18650 battery capacity tester specifically designed for measuring the capacity of 18650 batteries. The 1.77-inch TFT display can simultaneously display information such as battery internal resistance, capacity, voltage, current, and power; No cumbersome charging and discharging operations are required; three preset modes—automatic, charging, and discharging—are available. Select the appropriate mode and start the device; the program will run automatically. The discharge current is adjustable for ease of use. Technical Parameters: Install the power adapter and the 18650 battery to be tested; connect the Type-C power interface to the 5V power adapter using a Type-C data cable. An external power supply is used to charge the battery. If only discharging is required, no connection is needed; select the mode (default is AUTO automatic mode); click the "Start" button to start the program; wait for the program to finish running and the status indicator to stop. Regarding power-off data storage: This product does not have a power-off data storage function. Powering off, restarting, and switching operating modes will erase accumulated data. It can still be used normally. Operating modes correspond to status changes. Product Name: 18650 Battery Capacity and Internal Resistance Tester (Charge/Discharge Integrated Machine) Operating Voltage: DC5V Detection Voltage: ≤DC5V Capacity Measurement Range: 0~99999mAh Energy Measurement Range: 0~99999mWh Battery Internal Resistance Measurement: Supported, measurement error approximately 10% Real-time Voltage Display: Supported Real-time Current Display: Supported Real-time Power Display: Supported Running Time Recording: Supported Working Mode Indication: Supported Current Status Indication: Supported Simultaneous Discharge: Not Supported (Simultaneous 18650 battery testing and external power supply testing are not supported) Discharge Load: 10W 8J Cement Resistor x 2 Discharge Current Selection: 0.5A or 1A Charging Interface: Type-C External Discharge Interface: Type-C Preset Discharge Stop Voltage: 3V (Non-adjustable) Preset full charge stop voltage: 4.2V (non-adjustable) Color: Green Material: Plastic Package Contents: 1 x Battery Power Detection Module This package only includes the above contents; other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual item. Measurement tolerance is +/- 1-3cm.