1. What is Li-Ion Battery Capacity?

The capacity of a lithium-ion battery is typically measured in ampere-hours (Ah) and indicates how much charge the battery can hold. This calculator converts watt-hours (Wh) to ampere-hours (Ah) using the battery's nominal voltage.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Wh \) — Energy in watt-hours
• \( V \) — Nominal voltage of the battery
• \( Ah \) — Resulting capacity in ampere-hours

Explanation: The formula converts energy capacity (Wh) to charge capacity (Ah) by dividing by the battery's operating voltage.

3. Importance of Capacity Calculation

Details: Knowing the Ah capacity helps in battery comparison, system design, and estimating runtime for electrical devices.

4. Using the Calculator

Tips: Enter watt-hour rating (usually printed on battery) and nominal voltage (3.7V for single cell Li-Ion). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Wh and Ah?
A: Wh measures energy capacity, while Ah measures charge capacity. Wh accounts for voltage differences between batteries.

Q2: What's typical voltage for Li-Ion batteries?
A: Single cell: 3.7V nominal (4.2V full, 3.0V empty). Packs in series multiply this voltage.

Q3: Why convert Wh to Ah?
A: Many battery specifications and electrical systems use Ah for capacity measurement.

Q4: Can I use this for other battery types?
A: The formula works for any battery, but voltage values differ (e.g., lead-acid is 12V nominal).

Q5: How accurate is this calculation?
A: It's mathematically precise, but actual capacity may vary with temperature, age, and discharge rate.