1. What is Battery Runtime?

Battery runtime refers to the duration a battery can power a device before needing recharging. It's calculated by dividing the battery's capacity (in ampere-hours) by the current draw of the device (in amperes).

2. How Does the Calculator Work?

The calculator uses the battery runtime formula:

Where:

• Capacity — Battery capacity in ampere-hours (Ah)
• Load — Current draw of the device in amperes (A)

Explanation: This formula provides an estimate of how long a battery will last under a specific load, assuming ideal conditions.

3. Importance of Runtime Calculation

Details: Calculating battery runtime is essential for designing power systems, selecting appropriate batteries for applications, and ensuring devices have sufficient power for their intended use duration.

4. Using the Calculator

Tips: Enter battery capacity in Ah and load current in A. Both values must be positive numbers. The result shows estimated runtime in hours.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This provides a theoretical maximum. Actual runtime may vary based on battery chemistry, age, temperature, and discharge characteristics.

Q2: What factors affect actual battery runtime?
A: Temperature, discharge rate, battery age, and efficiency of the power conversion system can all impact actual runtime.

Q3: Should I derate the calculated runtime?
A: For critical applications, it's recommended to apply a safety factor (typically 20-30%) to the calculated runtime.

Q4: How does battery voltage factor into this calculation?
A: This calculation focuses on current draw. For power calculations (watts), you would need to consider voltage as well (Power = Voltage × Current).

Q5: Can this calculator be used for battery banks?
A: Yes, simply use the total capacity of the battery bank in the calculation.