1. What is Battery Runtime?

Battery runtime is the estimated time a battery can power a device before needing recharge. It's calculated by dividing the battery's watt-hour (Wh) capacity by the device's power consumption in watts (W).

2. How Does the Calculator Work?

The calculator uses the simple runtime formula:

Where:

• \( Wh \) — Battery capacity in watt-hours
• \( W \) — Device power consumption in watts

Explanation: Watt-hours represent total energy capacity, while watts represent energy consumption rate. Dividing capacity by consumption gives runtime.

3. Importance of Runtime Calculation

Details: Knowing battery runtime helps in planning power needs, selecting appropriate batteries, and ensuring devices can operate for required durations.

4. Using the Calculator

Tips: Enter battery capacity in watt-hours (Wh) and device power consumption in watts (W). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find battery Wh rating?
A: Usually printed on the battery or in specifications. For batteries rated in mAh, convert using: Wh = (mAh × V) / 1000.

Q2: Is this calculation accurate for all devices?
A: It provides theoretical maximum. Actual runtime may vary due to efficiency losses, temperature, and discharge rates.

Q3: What if my device power varies?
A: Use average power consumption or calculate runtime for different power modes separately.

Q4: How does battery age affect runtime?
A: As batteries age, their actual capacity decreases, resulting in shorter runtime than calculated.

Q5: Can I use this for solar power systems?
A: Yes, but account for inverter efficiency (typically 85-95%) and other system losses.