Features Test the Capacity of 1.2-12V Battery: This discharge tester is used to test the capacity of 1.2-12V battery. It adopts selected electronic components and has a sophisticated manufacturing process. Easy To Operate: Digital battery capacity tester is easy to operate and powered by a micro USB power supply, featuring reliability and high accuracy, small size and light weight. LED Display: The battery 18650 and other capacity test boards are designed with LED display, which can clearly indicate the parameters displayed on the display screen. Check Battery: This discharge tester allows you to check the test capacity, voltage and current of the battery, it is a very practical module electronic board. Portable Shape: The battery capacity test board has stable performance, high reliability, and a light and delicate shape, which can well meet our needs. Specification: Power Source Voltage: DC4.5-6V (micro USB) Working Current: ≤70mA Discharge Voltage: 1.00V-15.00V, resolution 0.01V Cutoff Voltage Range: 0.5-11.0V Supported Current: ≤3.000A, resolution 0.001A Voltage Test Error: <1%+0.02V Current Test Error: <1.2%+-0.002A Battery Capacity Range: 9999Ah (1Ah=1000mAh, the decimal point can move when the number is large, e.g. it displays X.XXX when lower than 10Ah, and displays XX.XX when higher than 10Ah... ) Weight: 27g / 1oz (approx.) Package list: 1 * Battery Capacity Meter 2 * Resistors (5W, 7.5R) 1 set * Fasteners Instruction: 1. The measured battery should be charged in the first place. 2. Connect the battery to the input terminals correctly(positive to positive, negative to negative), reverse input may damage the circuit.Connect load to the output positive and negative, then power the meter with micro USB work power (do not use a desktop computer or laptop USB as power supply), it displays the battery voltage at this time. 3. Direct start test just need to press the "OK" button, then meter will automatically  develop an appropriate cutoff voltage according to the battery fully charged voltage,  then begin testing after display flashing 3 times.If need manual setting up for cutoff voltage, you can press "+" or "-" button when ti shows battery voltage. The cutoff voltage is displayed with a initial "P", and the resolution is 0.1 V, press "OK" to start testing after setting. 4. The testing data will be displayed in turns among discharge capacity (Ah), real-time discharge current  (A) and battery voltage (V). When the battery voltage reaches set cutoff voltage, tester cut off the load control switch, and displays capacity (Ah) and fast flashing indicator light.  Package List