Features 1. Main Function: Supports battery testing under starting and charging conditions, displaying battery voltage, rated value, measured value, internal resistance, service life, and remaining battery parameters. 2. Additional Functions: Offers fast and standard test mode selection, battery waveform analysis viewing, image saving, and USB printing capability. 3. Multiple Testing Modes: Supports various test modes and standards for quick evaluation of vehicle battery performance with clear result display. 4. Practical Design: Covers 8 battery standards including CCA, JIS, GB, SAE, MCA, CA, DIN, IEC, EN, and BCI. Supports 9 languages: English, Spanish, French, Portuguese, Italian, German, Polish, Russian, and Chinese. 5. Wide Compatibility: Suitable for various 12V batteries, including standard lead-acid, AGM flat plate, AGM spiral, GEL, and EFB batteries. Specifications Item Type: Car Battery Tester Model: V311B Main Control Chip: APM32F103VCT6 Color: Blue Interface Type: Reverse polarity red and black clips Shell Material: ABS Display: 2.8-inch TFT color screen, resolution 240 x 320 External Power: 12V Working Voltage: 918V Measurement Standards: CCA, JIS, GB, SAE, MCA, CA, DIN, IEC, EN, BCI Measurement Types: Standard lead-acid, AGM flat plate, AGM spiral, GEL, EFB Measuring Range: CCA: 1002000A BCI: 1002000A CA: 1002000A MCA: 1002000A JIS: 26A1724SH52 DIN: 1001400A IEC: 1001400A EN: 1002000A SAE: 1002000A GB: 10250Ah Product Parameter Information 1. Voltage 2. Rated Value The nominal value marked on the battery, such as SAE CCA (cold cranking amps) or GB Ah (capacity). This value must be entered into the tester, and the corresponding standard selected. 3. Measured Value The current value assessed by the tester, such as CCA or Ah. This reflects the difference between the rated and actual performance. On a new battery, the measured value is typically close to the rated value. As the battery ages, the measured value decreases. 4. Internal Resistance The internal resistance of the battery varies by brand, type, temperature, and usage duration. Generally, a lower internal resistance indicates better battery performance. 5. Service Life A calculated value based on the rated and current condition of the battery, indicating the battery's aging level and remaining life percentage. 6. Remaining Charge The estimated charge level based on the current battery state. A fully charged battery reads 100%, similar to a smartphone battery indicator. During engine start, voltage fluctuates. Typically, if voltage drops below 8.5V, the engine may not start. A warning is usually triggered at 10.5V, though some vehicles alert at 11V. The normal resting voltage is around 11V. Measurement Standards Explanation: CCA: Cold Cranking Amps, defined by SAE and BCI, measures starting power at 0F (18C), commonly used for starter batteries. BCI: Battery Council International standard. CA: Cranking amps measured at 0C. MCA: Marine Cranking Amps, cold cranking performance at 0C. JIS: Japanese Industrial Standard, often shown as alphanumeric codes like 55D23 or 80D26. DIN: Standard by the German automotive industry. IEC: International Electrotechnical Commission standard. EN: European Committee for Standardization in the automotive sector. SAE: Society of Automotive Engineers standard. GB: Chinese National Standard. Package Includes 1 x V311B Car Battery Tester 1 x User Manual