1. What is Battery Run Time?

Battery run time is the duration a battery can power a device before needing recharge. It's calculated by dividing the battery's capacity (in amp-hours) by the discharge current (in amps).

2. How Does the Calculator Work?

The calculator uses the basic battery run time formula:

Where:

• Capacity — Battery capacity in amp-hours (Ah)
• Discharge Current — Current drawn by the device in amps (A)

Explanation: This formula assumes ideal conditions with constant current draw and 100% battery efficiency.

3. Importance of Run Time Calculation

Details: Calculating run time helps in selecting appropriate batteries for applications, estimating backup power duration, and designing power systems.

4. Using the Calculator

Tips: Enter battery capacity in Ah and discharge current in A. Both values must be positive numbers. For best results, use manufacturer's rated capacity.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This provides theoretical maximum. Real-world results vary due to temperature, age, discharge rate, and battery chemistry.

Q2: What affects battery run time?
A: Factors include discharge rate, temperature, battery age, depth of discharge, and number of charge cycles.

Q3: How does Peukert's effect relate to this?
A: At high discharge rates, actual capacity decreases (Peukert's effect). This simple formula doesn't account for that.

Q4: Can I use this for lithium-ion batteries?
A: Yes, but lithium-ion batteries often list capacity in mAh (divide by 1000 to get Ah).

Q5: What's typical capacity for car batteries?
A: Car batteries typically range 40-100Ah, but check CCA (cold cranking amps) for starting applications.