18650 Battery Capacity Calculator

18650 Battery Capacity Formula:

\[ \text{Total Capacity} = \text{Number} \times 3.7V \times 2500mAh / 1000 \text{ (Wh)} \]

Total Capacity:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the 18650 Battery Capacity Calculator?

The 18650 Battery Capacity Calculator estimates the total energy capacity of 18650 lithium-ion batteries in watt-hours (Wh). This calculation helps determine the overall energy storage capacity of battery packs using standard 18650 cells.

2. How Does the Calculator Work?

The calculator uses the following formula:

\[ \text{Total Capacity} = \text{Number} \times 3.7V \times 2500mAh / 1000 \text{ (Wh)} \]

Where:

\( Number \) — Number of 18650 cells
\( 3.7V \) — Nominal voltage of 18650 cells
\( 2500mAh \) — Typical capacity of standard 18650 cells
\( /1000 \) — Conversion from mAh to Ah for watt-hour calculation

Explanation: The formula calculates the total energy capacity by multiplying the number of cells by their individual energy content (voltage × capacity), converted to watt-hours.

3. Importance of Battery Capacity Calculation

Details: Accurate battery capacity calculation is essential for designing battery packs, estimating runtime for electronic devices, and ensuring proper power management in various applications.

4. Using the Calculator

Tips: Enter the number of 18650 cells in your battery configuration. The calculator assumes standard 3.7V nominal voltage and 2500mAh capacity per cell.

5. Frequently Asked Questions (FAQ)

Q1: What are 18650 batteries?
A: 18650 batteries are lithium-ion rechargeable batteries with 18mm diameter and 65mm length, commonly used in laptops, power tools, and electric vehicles.

Q2: Why use 2500mAh as standard capacity?
A: 2500mAh represents a typical capacity for standard 18650 cells, though capacities can range from 2000mAh to 3500mAh depending on the specific cell model.

Q3: What is the nominal voltage of 18650 cells?
A: Most 18650 lithium-ion cells have a nominal voltage of 3.7V, though this can vary slightly between different chemistry types.

Q4: Can I use this calculator for different battery types?
A: This calculator is specifically designed for standard 18650 cells. Other battery types may have different voltages and capacities.

Q5: How accurate is this calculation?
A: The calculation provides an estimate based on standard values. Actual capacity may vary depending on specific cell specifications, age, temperature, and discharge rates.