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 capacity by the current draw of the device.

2. How Does the Calculator Work?

The calculator uses the battery runtime equation:

Where:

• \( capacity\_ah \) — Battery capacity in ampere-hours (Ah)
• \( load\_a \) — Current draw in amperes (A)
• \( runtime \) — Estimated runtime in hours (h)

Explanation: This simple calculation provides the theoretical runtime under constant current draw. Actual runtime may vary due to factors like battery age, temperature, and discharge rate.

3. Importance of Runtime Calculation

Details: Knowing battery runtime helps in system design, backup power planning, and ensuring uninterrupted operation of critical devices.

4. Using the Calculator

Tips: Enter battery capacity in Ah and load current in A. Both values must be positive numbers. The result shows estimated runtime in hours.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This provides a basic estimate. Lithium-ion, lead-acid, and other chemistries have different discharge characteristics that may affect actual runtime.

Q2: How does battery age affect runtime?
A: As batteries age, their capacity decreases, resulting in shorter runtimes than calculated with nominal capacity.

Q3: What about varying load currents?
A: For variable loads, calculate runtime for each current segment or use average current for estimation.

Q4: Does temperature affect runtime?
A: Yes, extreme temperatures typically reduce battery capacity and runtime.

Q5: Should I include a safety margin?
A: Yes, it's recommended to multiply the calculated runtime by 0.7-0.8 for practical applications.