1. What is Battery Capacity?

Battery capacity is a measure of the charge stored in a battery, typically measured in ampere-hours (Ah). For a 100 watt-hour lithium battery, the capacity in Ah depends on the battery's voltage.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• 100 Wh — Fixed energy capacity of the battery
• Voltage — Nominal voltage of the battery (V)

Explanation: The formula converts watt-hours (energy) to ampere-hours (charge) by dividing by the battery voltage.

3. Importance of Capacity Calculation

Details: Knowing the Ah capacity helps in designing battery systems, estimating runtime, and ensuring compatibility with devices and chargers.

4. Using the Calculator

Tips: Enter the nominal voltage of your lithium battery in volts. The voltage must be greater than 0 for the calculation to work.

5. Frequently Asked Questions (FAQ)

Q1: Why use 100 watt-hours as the base?
A: 100Wh is a common energy rating for lithium batteries, especially in portable applications and air travel.

Q2: What are typical voltages for lithium batteries?
A: Common nominal voltages include 3.7V (single cell), 7.4V (2S), 11.1V (3S), etc. Check your battery specifications.

Q3: Does this work for other battery chemistries?
A: The formula works for any battery type, but the voltage range will differ for lead-acid, NiMH, etc.

Q4: How does this relate to battery runtime?
A: Runtime depends on the load current. Divide capacity (Ah) by current (A) to estimate hours of operation.

Q5: Why is voltage important in capacity calculation?
A: Watt-hours (energy) = Voltage × Amp-hours (charge). For a given energy, higher voltage means lower Ah capacity.