Feature: 1. Charge and discharge function, it is suitable for lithium/lead‑acid battery capacity test (charging 5A, discharging 20A, maximum power is 85W), and supports individual charging, discharging and one‑time charging and discharging tests. 2. Support to connect to a computer, it can use a dedicated USB to TTL serial port line, through the online software can be multiple cycles of charging and discharging and more extended functions. 3. Liquid crystal display screen, which can display test data such as voltage, current, capacity, time, power, and energy. 4. Four‑wire design, its voltage measurement channel and current measurement channel are wired separately to ensure measurement accuracy. 5. High accuracy, its test range is wide, and it can be applied to accurate industrial measurement with low error. Specification: Item Type: Battery Capacity Tester Material: Cold Rolled Steel Power Supply Mode: DC 19V-20V, Current Above 3.5A Discharge Current: 0.10-20.00A, The Minimum Step is 0.01A (The current is automatically limited when the power exceeds the limit) Charging Current: 0.10-5.00A, The Minimum Step is 0.01A (The maximum current above 10V is less than the power supply current) DSC-CC Mode (Constant Current Discharge): constant discharge current, used to test battery capacity. DSC-CP Mode (Constant Power): The discharge power is constant, used to simulate constant power equipment. Automatic Charge and Discharge: Support Automatic "Charge-Discharge-Charge" Mode Current Measurement: 0.10-20.00A, Accurate to 0.01A, Error ±0.5% Capacity Measurement: Within 10Ah, The Resolution is 0.001Ah; 10Ah-100Ah, The Resolution is 0.01Ah; Above 100Ah, The Resolution is 0.1Ah. Wiring Mode: Four-Wire Detection Computer Connection Interface: Dedicated USB to TTL Serial Cable (MiniUSB Port, Not Ordinary USB Cable). Package List: 1 x Battery Tester2 x Test Line1 x USB to TTL Cable1 x Adapter1 x Power Cord1 x Manual Note: This model product does not support Ni‑MH and Ni‑Cd charging.