Battery Capacity Calculator Mah

Capacity Conversion Formula:

\[ \text{Capacity (Wh)} = \frac{\text{mAh} \times \text{Voltage}}{1000} \]

Capacity (Wh):

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1. What is Battery Capacity Conversion?

Battery capacity conversion from milliamp-hours (mAh) to watt-hours (Wh) provides a more accurate measure of energy storage capacity by accounting for both current and voltage. This conversion is essential for comparing batteries with different voltages.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

\[ \text{Capacity (Wh)} = \frac{\text{mAh} \times \text{Voltage}}{1000} \]

Where:

\( mAh \) — Milliamp-hours (battery capacity rating)
\( Voltage \) — Battery nominal voltage (V)
\( 1000 \) — Conversion factor from milliamp-hours to amp-hours

Explanation: Watt-hours represent the total energy capacity, while mAh only indicates charge capacity. The voltage multiplier converts electrical charge to energy.

3. Importance of Watt-hour Calculation

Details: Watt-hour calculation is crucial for comparing battery performance across different chemistries and voltages, estimating runtime for devices, and complying with airline regulations for portable batteries.

4. Using the Calculator

Tips: Enter the mAh rating from your battery specification and the nominal voltage (typically 3.7V for lithium-ion, 1.2V for NiMH, 1.5V for alkaline). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why convert mAh to Wh?
A: Wh provides a standardized energy measurement that accounts for voltage differences, allowing accurate comparison between different battery types and chemistries.

Q2: What is the typical voltage for common batteries?
A: Lithium-ion: 3.7V, NiMH: 1.2V, Alkaline: 1.5V, Lead-acid: 12V, LiFePO4: 3.2V.

Q3: How does voltage affect battery capacity?
A: Higher voltage batteries deliver more power and energy for the same mAh rating. A 3000mAh battery at 3.7V has less energy than a 3000mAh battery at 12V.

Q4: Are there limitations to this calculation?
A: This calculation assumes constant voltage, but actual battery voltage decreases during discharge. It provides a theoretical maximum energy capacity.

Q5: Why do airlines use Wh instead of mAh?
A: Wh accurately represents energy content, which is what matters for safety regulations. Two batteries with the same mAh but different voltages have different energy contents.