1. What is Battery Capacity?

Battery capacity is a measure of the charge stored by the battery, typically measured in ampere-hours (Ah). It represents how much current a battery can deliver over a specified time period.

2. How Does the Calculator Work?

The calculator uses the basic capacity equation:

Where:

• \( Current \) — Discharge current in amperes (A)
• \( Time \) — Discharge time in hours (h)
• \( Capacity \) — Result in ampere-hours (Ah)

Explanation: The equation shows that capacity is directly proportional to both the current draw and the time that current can be maintained.

3. Importance of Capacity Calculation

Details: Knowing a battery's capacity is essential for determining how long it will last under specific loads, sizing batteries for applications, and comparing different battery types.

4. Using the Calculator

Tips: Enter the current in amperes and time in hours. Both values must be positive numbers. The calculator will compute the capacity in ampere-hours (Ah).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Ah and Wh?
A: Ah (ampere-hours) measures charge capacity, while Wh (watt-hours) measures energy capacity. Wh = Ah × Voltage.

Q2: Does higher capacity mean longer runtime?
A: Generally yes, if the load current remains constant. Runtime = Capacity / Current.

Q3: How does temperature affect capacity?
A: Capacity typically decreases at lower temperatures and may increase slightly at moderate higher temperatures.

Q4: What is C-rate?
A: C-rate is the charge/discharge current relative to capacity. 1C means discharging at current equal to the Ah rating in 1 hour.

Q5: Why do batteries show reduced capacity over time?
A: Due to chemical degradation, loss of active materials, and increased internal resistance from charge cycles.