1. What is mAh and mA?

mAh (milliamp-hours) is a unit of electric charge that represents battery capacity. mA (milliamps) is a unit of electric current that represents the rate at which charge flows.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( mAh \) — Battery capacity in milliamp-hours
• \( mA \) — Current draw in milliamps

Explanation: This formula calculates how long a battery will last by dividing its total capacity by the current being drawn from it.

3. Importance of Battery Life Calculation

Details: Calculating battery life helps in designing electronic devices, planning power requirements, and estimating how long a device can operate on a single charge.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This provides an estimate. Real-world performance may vary due to factors like battery age, temperature, and discharge rate.

Q2: How does voltage factor into this calculation?
A: This simple calculation assumes constant voltage. For more precise calculations involving different voltages, watt-hours should be used instead.

Q3: What's a typical mAh rating for common batteries?
A: Smartphone batteries range from 2000-5000mAh, AA batteries about 2000-3000mAh, and laptop batteries 4000-10000mAh.

Q4: Why does my device last less than calculated?
A: Devices don't draw constant current, have power management systems, and batteries lose capacity over time.

Q5: Can I use this for battery charging time?
A: No, this calculates discharge time. Charging involves different considerations like charging current and efficiency.