Features 1、External Load Control: Obtain real time integrated discharge current capacity results by controlling load shutdown. 2、Small Error: The highest battery capacity supports 9999AH (9999000MAH), the voltage and current measurement error is small. 3、Automatic Identification: Automatically identify and develop the appropriate battery terminal voltage, and it can also be adjusted manually. 4、Micro USB Interface: With a micro USB interface, the power supply voltage is DC4.5‑6V, which can be powered by various devices. 5、For 12V Battery: The battery capacity meter has digital display and 3 control buttons, suitable for 12V 18650 acid battery capacity test. Specification Item Type: Battery Capacity Meter Power Supply Voltage: DC4.5-6V (micro USB interface) Working Current: No more than 70mA Discharge Voltage: 1.00V-15.00V, resolution 0.01V Termination Voltage Range: 0.5-11.0V Support Through Current: Maximum 3.000A, resolution 0.001A Maximum Error of Voltage Measurement: 1%+0.02V Maximum Error of Current Measurement: 1.5%±0.008A Maximum Battery Capacity Range: 9999Ah (1Ah=1000mAh) when the value is large, the decimal point is shifted to switch, when it is lower than 10Ah, it is displayed as X.XXX, when it reaches 10Ah or more, it is displayed as XX.XX, and so on. Circuit Board Size: Approx. 50 x 37mm / 2 x 1.5in Equipped with Resistance Estimation Method: Estimate the resistance value according to Ohm law. The battery voltage is divided by the expected discharge current. The resistance power selection is the battery voltage multiplied by the expected discharge current. The result is more than twice. Ensure that the current cannot exceed 3.0A at full voltage! For example, if you need to test a 12V battery with a 2A current, the resistance needs to be 6Ω and the power is 50W. The full voltage of the new 12V battery is about 13.5V. At this time, the corresponding maximum current is 13.5/6=2.25A, which is less than 3A, so it can be used. In addition, if you use a bulb test, the maximum current can only be half (1.5A), because the cold resistance of the bulb is very low, and the starting impulse current is very large. If it is selected too large, it may directly burn the circuit! Error Code and Meaning: Err1: The battery voltage is higher than 15V Err2: The battery voltage is lower than the set termination voltage Err3: The battery cannot withstand the load discharge current or the internal resistance of the circuit is too large Err4: Excessive current (current exceeds 3.1A) Secondary Calibration Operation: Press and hold the three buttons at the same time to power on the tester and enter the calibration mode. First, display the number of calibration records and then enter the formal calibration sampling program to display 0u0A. At this time, short-circuit the positive and negative poles and press the OK button to complete the display J10u, and enter the input Apply 10.00V standard DC voltage between the positive and negative poles and press the OK button, and then J2.0A will be displayed. Apply 2.0A constant DC current to the output negative (inflow direction) and input negative (outflow direction) and then press the OK button. Complete the calibration. The tester will pre audit the calibration data. If the calibration data is reliable, 4 calibration numbers will be displayed in turn and then exit. If the pre audit finds that the data is not reliable, the data will be discarded and exit. Package List 1 x Battery Tester 2 x Resistance 4 x Copper Feet 4 x Screw