1. What is Battery Runtime?

Battery runtime is the estimated time a battery can power a device before needing recharge or replacement. It depends on the battery's capacity and the device's current draw.

2. How Does the Calculator Work?

The calculator uses the battery runtime equation:

Where:

• \( Battery\ Capacity \) — The total charge stored in the battery (milliamp-hours)
• \( Average\ Current\ Draw \) — The device's average current consumption (milliamps)

Explanation: The equation calculates how long a battery can supply current to a device before being depleted.

3. Importance of Battery Life Calculation

Details: Accurate battery runtime estimation helps in designing power systems, selecting appropriate batteries, and predicting device operation time between charges.

4. Using the Calculator

Tips: Enter battery capacity in mAh (found in battery specifications) and average current draw in mA (measured or estimated). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

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

Q2: How do I measure average current draw?
A: Use a multimeter in series with your circuit, or check device specifications. For variable loads, measure over typical usage.

Q3: What affects battery capacity?
A: Capacity decreases with age, high discharge rates, and extreme temperatures. Manufacturer ratings are for ideal conditions.

Q4: Should I derate the calculated runtime?
A: For critical applications, multiply the result by 0.7-0.8 to account for real-world factors not in this simple calculation.

Q5: Can I use this for battery packs?
A: Yes, if using the pack's total capacity. For series connections, use the single cell capacity and total voltage.