Here's a step-by-step guide to calculating the internal resistance of a battery: Measure the Open-Circuit Voltage (VOC): This is the voltage of the battery when no load is connected. Use a multimeter for accurate results. Connect a Known Load: Attach a known resistor to the battery.. Step 1: Check the Resistor's Resistance. Even though the resistance value is displayed, you must double-check that the real resistance is the same as the written number. The true value of most resistors has a 10percent tolerance, however this varies based on the kind of resistor employed. Step 2: Determine the battery's no-load voltage.
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Use the formula below to determine what resistor to use. Step 2: Measure the voltage drop: Use the multimeter to measure the voltage drop across the terminals of the battery. Ensure that the multimeter is set to measure DC voltage. Step 3: Calculate IR: Divide the voltage drop across the terminals by the load current.. There are two methods for measuring internal resistance: the AC method (AC-IR) and the DC method (DC-IR). Testing on production lines uses the AC method, which is introduced by this article. When measuring the internal resistance of a battery cell using the AC method, an AC resistance meter specifically designed to measure low resistance levels.
