Internal Resistance Is An Important Indicator Of Battery Performance. Under Normal Circumstances, Batteries With Small Internal Resistance Have Strong Discharge Capacity. Support Current Discharge: Batteries With High Internal Resistance Have Weak Discharge Capabilities. Internal Resistance Is Like Age. Measuring The Internal Resistance Can Help Identify Faulty Batteries And Match Paired Batteries. When Assembling Series-Connected Battery Packs, Cell Capacity, Internal Resistance, And Voltage Need To Be Matched. The Performance Of The Battery Pack Follows The "Barrel Principle", Where Overall Performance Depends On The Weakest Battery. Basic Resistance Accuracy: 0.5% Basic Voltage Accuracy: 0.5% Resistance Measurement Range: 0.01μΩ to 200Ω Voltage Measurement Range: 0 to 100VDC Test Frequency: AC 1KHz Test Current: 50mA for 2MΩ/20MΩ Range; 5mA for 200MΩ/2Ω Range; 0.5mA for 20Ω/200Ω Range Serial Port: Must Be Enabled On The Instrument To Connect To A Computer For Communication. Disabled By Default. Baud Rate: 115200 Resistance Range: 6 Ranges, Automatic And Manual Voltage Range: 3 Ranges, Automatic And Manual Display Update Rate: 5 Times Per Second Resistance Calibration: Each Range Calibrated Manually And Independently Voltage Calibration: Each Range Calibrated Manually And Independently Backlight: Yes Display Results: LCD Screen, Direct Reading Energy-Saving Settings: Auto Power-Off After 30 Minutes Of Inactivity Note: Product Appearance, Color, And Printed Characters May Vary Slightly Between Batches, But Will Not Affect Functionality Type: C With Probe Color: As Shown Material: ABS Size: Approximately 166x80x28mm Package Contents: 1 x Battery Internal Resistance Meter 1 x Probe Only The Above Items Are Included, Other Accessories Are Not Included Note: Lighting Effects And Monitor Differences May Cause Slight Color Variations Between Image And Actual Item. Measurement Tolerances Allow For +/- 1-3cm Error