1. What is Battery Run Time?

Battery run time refers to the duration a battery can power a device before needing recharging. For lithium batteries, this is calculated by dividing the battery's capacity (in ampere-hours) by the discharge current (in amperes).

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Capacity — Battery capacity in ampere-hours (Ah)
• Discharge Rate — Current draw in amperes (A)

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

3. Importance of Run Time Calculation

Details: Calculating battery run time is essential for designing power systems, selecting appropriate batteries for applications, and estimating how long devices will operate before requiring recharging.

4. Using the Calculator

Tips: Enter battery capacity in Ah and discharge rate in A. Both values must be positive numbers. The result shows estimated run time in hours.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This formula provides a basic estimate. Actual run time may vary based on battery chemistry, temperature, age, and discharge characteristics.

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

Q3: How does discharge rate affect run time?
A: Higher discharge rates typically reduce overall capacity due to internal resistance and efficiency losses, especially in lead-acid batteries.

Q4: Can I use this for battery packs?
A: Yes, but use the total capacity of the pack and the total discharge current. For series connections, voltage adds but capacity stays the same.

Q5: Why is my actual run time different from calculated?
A: Real-world factors like voltage drop, efficiency losses, battery age, and varying discharge rates can cause differences between calculated and actual run times.