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 (in amp-hours) by the current draw (in amps) of the device.

2. How Does the Calculator Work?

The calculator uses the basic runtime equation:

Where:

• \( Capacity \) — Battery capacity in amp-hours (Ah)
• \( Current \) — Device current draw in amps (A)

Explanation: This simple calculation provides theoretical runtime under ideal conditions. 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 selecting appropriate batteries for applications, planning backup power needs, and optimizing device power consumption.

4. Using the Calculator

Tips: Enter battery capacity in Ah and device current draw in A. Both values must be positive numbers. For best accuracy, use manufacturer-specified values.

5. Frequently Asked Questions (FAQ)

Q1: What affects actual battery runtime?
A: Factors include battery age, temperature, discharge rate, and whether the battery is being charged while in use.

Q2: How accurate is this calculation?
A: This provides theoretical maximum. Actual runtime is typically 70-90% of calculated value due to inefficiencies.

Q3: Can I use this for lithium-ion batteries?
A: Yes, but lithium batteries often have more complex discharge characteristics that may affect actual runtime.

Q4: What if my device uses watts instead of amps?
A: Convert watts to amps by dividing by voltage (A = W/V). You'll need to know your system voltage.

Q5: Does this work for battery banks?
A: Yes, as long as you know the total capacity (Ah) of the bank and the current draw.