1. What is Battery Discharge Time?

Battery discharge time is the duration a battery can supply power before it needs recharging. 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 discharge time formula:

Where:

• Battery Capacity — Total charge stored in the battery (Ah)
• Discharge Current — Current drawn from the battery (A)

Explanation: The formula provides an estimate of how long a battery will last under a specific load. Actual runtime may vary based on temperature, battery age, and discharge rate effects.

3. Importance of Discharge Time Calculation

Details: Knowing discharge 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 amp-hours (Ah) and discharge current in amps (A). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This is most accurate for lead-acid and lithium-ion batteries. Some chemistries (like NiMH) may show different performance.

Q2: Why does my battery last less than calculated?
A: Factors like temperature, battery age, high discharge rates, and voltage cutoffs can reduce actual runtime.

Q3: Can I use this for battery packs?
A: Yes, if all cells are identical and connected properly. For series connections, use pack voltage but same Ah rating.

Q4: What's the difference between Ah and Wh?
A: Amp-hours (Ah) measure charge capacity, while watt-hours (Wh) measure energy capacity (Ah × voltage).

Q5: How does discharge rate affect capacity?
A: Higher discharge rates often reduce usable capacity (Peukert effect), especially in lead-acid batteries.