1. What is Battery Energy?

Battery energy represents the total amount of electrical energy a battery can store and deliver. It's typically measured in watt-hours (Wh) and determines how long a battery can power a device.

2. How Does the Calculator Work?

The calculator uses the fundamental energy equation:

Where:

• \( Voltage \) — The nominal voltage of the battery (V)
• \( Amp\text{-}Hours \) — The battery's capacity in ampere-hours (Ah)

Explanation: This simple multiplication gives the total energy capacity in watt-hours, which is a more useful measure for comparing batteries than Ah alone.

3. Importance of Energy Calculation

Details: Knowing a battery's energy capacity helps in selecting the right battery for an application, estimating runtime, and comparing different battery types.

4. Using the Calculator

Tips: Enter the battery's nominal voltage (common values are 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: Amp-hours (Ah) measure charge capacity, while watt-hours (Wh) measure energy capacity. Wh accounts for both voltage and current, making it better for comparing different battery types.

Q2: Why is my battery's actual capacity lower than rated?
A: Actual capacity can be affected by age, temperature, discharge rate, and other factors. Manufacturers often rate batteries under ideal conditions.

Q3: How does this relate to battery runtime?
A: Runtime = Energy (Wh) / Power (W). For example, a 100Wh battery can theoretically power a 50W device for 2 hours.

Q4: Can I use this for battery packs?
A: Yes, for series connections use the total voltage, for parallel connections sum the Ah values. For complex configurations, calculate each cell's energy and sum them.

Q5: What's a typical energy capacity for common batteries?
A: AA alkaline: ~3Wh, 18650 lithium-ion: ~10Wh, car battery: ~600Wh, powerwall: ~13,500Wh.