This product supports internal resistance and single channel capacity measurement; supports charging and up to 9 charge and discharge cycles in automatic mode. It can be used not only to charge the battery, but also to measure the internal resistance and capacity of the battery. And more importantly, it can be used to dispense battery capacity and duty cycles. Features: Digital display: 1,77 inch digital display, clearly display real-time voltage, real-time current, real-time power, cumulative capacity, cumulative energy, status indication, operating mode, stop discharge voltage, number of cycles, battery internal resistance and cumulative time. Multifunctional design: it can be used not only to charge the battery, but also to measure the internal resistance and battery capacity. And more importantly, it can be used to dispense battery capacity and duty cycles. Three operating modes: pre-set automatic, three charging and discharging modes, select the appropriate mode, the program starts automatically, the discharge current can be switched for ease of use. Charging function: External 5V power supplies, maximum current 1A through the charging system during charging, and the charging process records the capacity and charging time of the amount of energy. (Not suitable for charging LiFePO4 batteries. ) Internal resistance test: The product uses the 2-wire DC method to test the internal resistance of the battery with high accuracy when the battery is fully charged. Capacity test: The capacity test is carried out by resistive discharge, and the results are only the capacity measured between the beginning of the battery discharge during the test phase and the stop of the trigger. The cumulative capacity, energy and time are recorded during the discharge process. Battery capacity division and duty cycle: Battery capacity division and duty cycle is the process of charging, discharging and recharging. The stop voltage must not be lower than 2,8V during use, otherwise it cannot be charged, and the program cannot work properly. Data erasure function: Automatic zeroing of capacity, energy and time data when switching off and switching modes. Language switching: two working language design, the factory default language is Chinese, but you can freely switch according to your preferences. Technical data: Name: Battery Capacity Tester Material: printed circuit board Working power supplies: DC5V power supplies or 18650 battery (must be prepared by yourself) Suitable battery: meet 2,5-3,5V discharge stop voltage, 2,8V starts, full 4,2V battery also apply. Power supply interface: Type-C interface, power cable on its own (mobile phone cable with C port) System Language: Chinese (Default), English Number of tests: 1-channel charge and discharge measurement (only the right position of the battery) Internal resistance measurement: supported, using two-wire DC method to test internal resistance Charging function: supported, fully automatic charging with cut-off (LiFePO4 charging is not supported) Discharge function: operated, automatic stop when conditions are met, discharge current is not adjustable Automatic charging and discharging: supported, the battery is fully charged at the end of automatic mode Charging and Discharging Cycle: Supported, adjustable 1~9 cycles (supported only in automatic mode) Status Indication: Supported Hold 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 levels Discharge current: bidirectional resistor, max. 1A current, non-adjustable, does not support independent transformation Charging voltage: special control of battery charging system, max. 1A charging, fully charged voltage is 4,2V Power failure recording: only setting parameters are saved, not measurement data Product Size: 110*89*30mm/4.33*3.50 * 1,18 inch Item Weight: 80 g/2,82 oz Package Weight: 120 g / 4,23 oz List of things to pack: 1 * Battery Capacity Tester