This tool helps you calculate the total capacity and voltage of your 18650 battery pack based on your configuration.
18650 Battery Pack Calculator
This calculator helps you determine the specifications of a 18650 battery pack based on the number of cells in series and parallel, as well as the capacity and voltage of an individual cell.
How to Use
Fill in the number of cells in series and parallel, the capacity of a single cell in mAh, and the voltage of a single cell in volts (default is 3.7V). Press the “Calculate” button to get the total voltage, capacity, and energy of the battery pack.
Calculations
- Total Pack Voltage (V) = Number of Cells in Series * Single Cell Voltage
- Total Pack Capacity (mAh) = Number of Cells in Parallel * Single Cell Capacity
- Total Pack Energy (Wh) = (Total Pack Voltage * Total Pack Capacity) / 1000
Limitations
This calculator assumes that all cells have identical capacity and voltage. Variations in individual cell performance can affect the overall pack performance. Always ensure you are using matched cells and follow safety guidelines when assembling battery packs.
Use Cases for This Calculator
Calculate Total Capacity of Battery Pack
Enter the number of 18650 batteries in your pack and their individual capacities in mAh to instantly calculate the total capacity of your battery pack. Ensure your batteries are of the same capacity for accurate results.
Estimate Voltage of Battery Pack
By specifying the number of batteries connected in series, this function will calculate the total voltage output of your battery pack. This feature helps you optimize your battery setup for desired voltage requirements.
Determine Energy Density of Battery Pack
Input the weight of your battery pack in grams and its total capacity in mAh to determine the energy density in Wh/kg. This gives you insights into the efficiency and performance of your battery configuration.
Calculate Run Time of Device
Specify the average current draw of your device in mA to find out how long your 18650 battery pack will power it. This essential calculation helps you plan for continuous usage without unexpected power failures.
Optimize Series vs. Parallel Connection
Experiment with different series and parallel configurations to see how they impact voltage and capacity. This feature helps you decide whether to prioritize voltage, capacity, or a balance between the two in your battery pack design.
Estimate Charging Time
Enter the charging current in mA and the total capacity of your battery pack to estimate the time required for a full charge. This calculation aids in scheduling and managing charging cycles effectively.
Compare Battery Pack Configurations
Input details of multiple battery pack configurations to compare total capacity, voltage output, and energy density. This allows you to make informed decisions based on performance metrics that matter to you.
Calculate Internal Resistance
By entering the discharge current in mA and voltage drop during discharge, you can calculate the internal resistance of your battery pack. Understanding internal resistance is crucial for optimizing efficiency and performance.
Determine Discharge Rate
Specify the capacity of your battery pack in mAh and the discharge current in mA to calculate the discharge rate in C. This information helps you select batteries suitable for high-drain devices and applications.
Optimize Battery Pack Efficiency
Experiment with different parameters such as capacity, voltage, and current draw to find the ideal balance for maximizing the efficiency of your 18650 battery pack. This tool assists in fine-tuning your setup for optimal performance and longevity.