Item Type: Battery Internal Resistance Tester Material: PCB Screen Size: Approx. 1.77in / 4.5cm Working Power Supply: DC5V power supply or 18650 battery x 2 (shipped without battery) Applicable Battery: Suitable for all batteries that meet the requirements of stopping discharge voltage of 2.5-3.5V and starting from 2.8V to 4.2V Power Supply Interface: Type C interface, power supply line self prepared (C port mobile phone line) System Language: Chinese (default), English Test Quantity: 1 way charging and discharging measurement (only right battery position) Internal Resistance Measurement: Support, use DC two wire method to test internal resistance Charging Function: Support, automatic cut off charging when fully charged (lithium iron phosphate battery charging is not supported) Discharge Function: Support, automatically stop when conditions are met, and the discharge current is not adjustable Automatic Charging and Discharging: Support. The battery is fully charged at the end of automatic mode Cyclic Charging and Discharging: Support, 1 to 9 cycles adjustable (only supported in automatic mode) Status Prompt: Support Stop Discharge Voltage: 2.5V, 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, 11 adjustable gears Discharge Current: Two circuit resistance, maximum current of about 1A, non adjustable, independent transformation not supported Charging Voltage: Controlled by a special battery charging chip, with a maximum charge of about 1A and a full charge voltage of 4.2V Power Off Saving: Only save the set parameters, not the measurement data