1. What is the Battery Life Equation?

The Battery Life equation estimates how long a lithium coin cell battery will last based on its capacity and the current draw of the device it powers. It provides a theoretical maximum runtime under ideal conditions.

2. How Does the Calculator Work?

The calculator uses the Battery Life equation:

Where:

• \( \text{Lithium Capacity} \) — Battery capacity in milliamp-hours (mAh)
• \( \text{Load Current} \) — Current draw of device in milliamps (mA)

Explanation: The equation calculates runtime by dividing the total charge capacity by the rate of consumption.

3. Importance of Battery Life Calculation

Details: Accurate battery life estimation is crucial for designing battery-powered devices, selecting appropriate battery sizes, and predicting maintenance intervals.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for real-world use?
A: This provides theoretical maximum. Actual runtime may be 20-30% less due to temperature, battery age, and other factors.

Q2: What's typical capacity for coin cell batteries?
A: Common CR2032 has ~220mAh, smaller cells like CR2016 have ~90mAh, larger ones like CR2450 have ~600mAh.

Q3: How to measure actual current draw?
A: Use a multimeter in series with battery in active mode. For intermittent devices, measure average current.

Q4: Does this work for other battery types?
A: The equation works for any battery, but capacity ratings differ (e.g., Li-ion uses different discharge curves).

Q5: How to extend battery life?
A: Reduce current draw with sleep modes, efficient components, and optimal voltage regulation.