The product supports four-channel capacity and internal resistance measurement.Support separate charging and discharging, and support up to 9 charging and discharging cycles in automatic mode Each channel is of each other, set separately, operates independently, and does not interfere with each other. 18650 battery holder uses compact battery holder, suitable for flat-head battery measurement Active cooling of fan supports overheating protection. Using DC two-wire method to measure internal resistance. Working voltage: DC5V. 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: Dual Type-C power supply interface (power supply and power cord are not included) System language: English/Chinese can be switched Test quantity: 4-way charging and discharging measurement Internal resistance measurement: support, use DC two-wire method to test internal resistance Charging function: support, automatic cut-off charging when fully (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: supported. The battery is fully at of automatic mode Cyclic charging and discharging: supported, 1~9 cycles adjustable (only supported in automatic mode) Status prompt: Supported Cooling mode: fan active cooling Overheat protection: 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: the maximum current is about 1A, which is not adjustable, and does not support formation 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 se