1. What is the Battery Capacity Formula?

The Battery Capacity Formula calculates the ampere-hour (Ah) capacity of a battery by dividing the energy content in watt-hours (Wh) by the battery voltage in volts (V). This provides the theoretical capacity of the battery.

2. How Does the Calculator Work?

The calculator uses the battery capacity equation:

Where:

• Energy — Total energy stored in the battery (watt-hours)
• Voltage — Nominal voltage of the battery (volts)

Explanation: The equation converts energy capacity (Wh) to charge capacity (Ah), which is more commonly used for battery specifications.

3. Importance of Battery Capacity Calculation

Details: Knowing the battery capacity helps in designing power systems, estimating runtime, and comparing different battery types and configurations.

4. Using the Calculator

Tips: Enter energy in watt-hours (Wh) and voltage in volts (V). Both values must be positive numbers. Common battery voltages are 3.7V (Li-ion), 12V (lead-acid), etc.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Wh and Ah?
A: Watt-hours measure energy capacity, while ampere-hours measure charge capacity. Wh takes voltage into account, making it better for comparing different battery types.

Q2: How do I find my battery's energy in Wh?
A: Many batteries list Wh directly. If not, multiply Ah by nominal voltage (e.g., 5Ah × 12V = 60Wh).

Q3: Why is voltage important in capacity calculation?
A: Voltage determines how much energy each coulomb of charge carries. Higher voltage means more energy for the same current flow.

Q4: Does temperature affect battery capacity?
A: Yes, capacity typically decreases at lower temperatures and may increase slightly at moderate temperatures.

Q5: Is this the same as C-rate?
A: No, C-rate describes charge/discharge current relative to capacity (e.g., 1C = full capacity in 1 hour). This calculator gives the total capacity.