1. What is Watt-Hours (Wh)?

Watt-hours (Wh) is a unit of energy that measures the capacity of a battery to deliver power over time. It represents how many watts a battery can supply for one hour before being depleted.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Wh \) — Watt-hours (energy capacity)
• \( V \) — Voltage (electrical potential)
• \( Ah \) — Amp-hours (charge capacity)

Explanation: Multiplying voltage by amp-hours gives the total energy storage capacity of the battery in watt-hours.

3. Importance of Wh Calculation

Details: Knowing a battery's watt-hour rating helps compare different batteries, estimate runtime for devices, and ensure compliance with airline regulations for portable batteries.

4. Using the Calculator

Tips: Enter the battery's nominal voltage (typically 3.7V for lithium-ion, 12V for lead-acid) and its amp-hour rating. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Wh and Ah?
A: Ah measures charge capacity, while Wh measures energy capacity. Wh accounts for both voltage and current, making it more useful for comparing different battery types.

Q2: How do I convert Wh to kWh?
A: Divide Wh by 1000. For example, 5000 Wh = 5 kWh.

Q3: Why do airlines have Wh limits?
A: Airlines limit battery size (typically to 100Wh) for safety reasons, as larger batteries pose greater fire risks.

Q4: Can I calculate runtime from Wh?
A: Yes, divide Wh by your device's wattage to estimate hours of operation (e.g., 60Wh battery / 15W device = ~4 hours).

Q5: Are there limitations to this calculation?
A: This assumes ideal conditions. Actual capacity may vary with temperature, discharge rate, and battery age.