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Calculating the Residual Capacity of the HV Battery (Current 2-4Ah) • Calculating the Residual Capacity of the HV Battery (Current... Estimating the Capacity of the High Voltage Battery - Instructions from the Developer. All models (except Prius Plus and Prius Plugin) have a nominal battery capacity of 6.5Ah. To estimate the capacity, follow these guidelines: 1) Ensure at least 60% SOC, engine and battery at operating temperatures (i.e. not too cold or too hot) 2) Park the car 3) Run the A/C at the lowest temperature to slightly increase the load on the battery 4) Ensure the gasoline engine is not running and phase S1 is complete 4) Run the battery test (HV Check or Battery Check) 5) Continue testing until the actual SOC is at least 10% less than the initial SOC. The estimated capacity will change color when enough data has been collected.