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Battery Capacity Formula:
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Battery capacity represents the total amount of electrical energy a battery can store and deliver. It's typically measured in watt-hours (Wh) and indicates how long a battery can power a device before needing recharge.
The calculator uses the battery capacity formula:
Where:
Explanation: This formula converts the battery's electrical charge capacity (Ah) into energy capacity (Wh) by multiplying by the operating voltage.
Details: Knowing battery capacity helps determine runtime for electronic devices, compare different batteries, design power systems, and ensure proper battery selection for specific applications.
Tips: Enter the battery voltage in volts and the amp-hour rating. Both values must be positive numbers. Common battery voltages include 3.7V (lithium-ion), 12V (car batteries), and 1.5V (AA batteries).
Q1: What's the difference between Ah and Wh?
A: Amp-hours (Ah) measure electrical charge, while watt-hours (Wh) measure energy. Wh accounts for both voltage and current, giving a better indication of total energy storage.
Q2: Why is battery capacity important?
A: It determines how long your devices will run, helps in battery selection for projects, and allows comparison between different battery types and sizes.
Q3: Can I use this for all battery types?
A: Yes, this formula works for lithium-ion, lead-acid, NiMH, and other battery chemistries as long as you know the voltage and Ah rating.
Q4: How accurate is this calculation?
A: It provides theoretical maximum capacity. Actual usable capacity may be less due to discharge rates, temperature, and battery age.
Q5: What affects real-world battery capacity?
A: Discharge rate, temperature, age, number of charge cycles, and battery health can all reduce actual capacity below the rated value.