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Battery Capacity Formula:
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The battery capacity formula calculates the capacity in amp-hours (Ah) from energy in watt-hours (Wh) and voltage in volts (V). This conversion is essential for understanding battery performance and specifications.
The calculator uses the battery capacity formula:
Where:
Explanation: This formula converts energy measurement from watt-hours to amp-hours, which is a more common unit for battery capacity specification.
Details: Accurate battery capacity calculation is crucial for determining how long a battery will last under specific loads, selecting appropriate batteries for applications, and comparing different battery specifications.
Tips: Enter energy in watt-hours (Wh) and voltage in volts (V). Both values must be positive numbers. The calculator will compute the battery capacity in amp-hours (Ah).
Q1: Why convert Wh to Ah for battery capacity?
A: While Wh represents total energy, Ah represents charge capacity, which is more useful for calculating runtime with specific current draws.
Q2: What's the difference between Wh and Ah?
A: Watt-hours measure energy (power × time), while amp-hours measure charge (current × time). They're related through voltage: Wh = Ah × V.
Q3: Can I use this for all battery types?
A: Yes, this formula works for any battery type (Li-ion, Lead-acid, NiMH, etc.) as it's a simple unit conversion.
Q4: How accurate is this calculation?
A: The calculation is mathematically precise, but actual battery performance may vary due to temperature, discharge rate, and age.
Q5: Why do battery specifications often list both Wh and Ah?
A: Wh gives total energy content, while Ah helps calculate runtime with specific devices. Both are important for different applications.