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Battery Capacity Formula:
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The battery capacity formula calculates the energy capacity of lithium-ion batteries in watt-hours (Wh) by multiplying the rated voltage (V) by the rated amp-hours (Ah). This provides a standardized measurement of energy storage capacity.
The calculator uses the battery capacity formula:
Where:
Explanation: This formula converts electrical charge capacity (Ah) into energy capacity (Wh), providing a more accurate representation of how much energy a battery can store and deliver.
Details: Accurate energy capacity calculation is essential for comparing battery performance, estimating runtime for electronic devices, designing power systems, and ensuring proper battery selection for specific applications.
Tips: Enter the rated voltage in volts and the rated capacity in amp-hours. Both values must be positive numbers. The calculator will compute the energy capacity in watt-hours.
Q1: Why use watt-hours instead of amp-hours?
A: Watt-hours account for both voltage and current, providing a more accurate measure of total energy capacity compared to amp-hours alone.
Q2: What are typical Wh values for lithium-ion batteries?
A: Capacity varies widely - smartphone batteries: 10-20 Wh, laptop batteries: 40-100 Wh, electric vehicle batteries: 20,000-100,000+ Wh.
Q3: How does temperature affect battery capacity?
A: Lithium-ion batteries typically deliver reduced capacity at lower temperatures and may have slightly increased capacity at moderate temperatures.
Q4: Can this formula be used for all battery types?
A: While the formula works for any battery, the voltage value should be the nominal voltage specific to the battery chemistry.
Q5: How accurate is this calculation for real-world usage?
A: This calculates theoretical maximum capacity. Actual usable capacity may be 10-20% less due to discharge rates, age, and temperature effects.