1. What is Battery Runtime?

Battery runtime is the estimated time a battery can power a device before needing recharge. It depends on the battery's capacity, voltage, and the power consumption of the connected load.

2. How Does the Calculator Work?

The calculator uses the battery runtime formula:

Where:

• Battery Capacity — Measured in ampere-hours (Ah)
• Battery Voltage — Measured in volts (V)
• Load Power — Measured in watts (W)

Explanation: The formula calculates how long a battery can sustain a given power load by converting the battery's energy capacity (Wh) and dividing by the load's power consumption.

3. Importance of Runtime Calculation

Details: Accurate runtime estimation helps in system design, backup power planning, and ensures devices have sufficient power for their intended operation period.

4. Using the Calculator

Tips: Enter battery capacity in Ah, voltage in V, and load power in W. All values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for battery efficiency?
A: No, this is theoretical maximum. Actual runtime may be 10-30% less due to efficiency losses, temperature, and battery age.

Q2: Can I use this for lithium-ion batteries?
A: Yes, the formula works for all battery types, but lithium batteries typically have better efficiency than lead-acid.

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

Q4: How accurate is this calculation?
A: It provides a good estimate but doesn't account for battery discharge curves, temperature effects, or aging.

Q5: Can I calculate required battery size for a target runtime?
A: Yes, rearrange the formula: Battery Capacity (Ah) = (Runtime × Load Power) / Battery Voltage.