Battery Pack Calculator
Plan an NxM pack from individual cells.
Your numbers
Your results
Pack voltage (V)
Pack voltage (V)
—
Pack capacity (Ah)
—
Pack energy (Wh)
—
Total cells
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Max continuous current (A)
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Battery Pack Calculator by TheCalcTools
How the Battery Pack Calculator works
Enter the nominal voltage, capacity and current rating of one cell.
Series connections add voltage; parallel connections add capacity and current.
Energy is pack voltage × pack capacity.
The formula
V_pack = V_cell × seriesAh_pack = Ah_cell × parallel
Worked example
Using the default values shown in the calculator:
| Cell voltage (V) | 3.6 |
|---|---|
| Cell capacity (Ah) | 3 |
| Cells in series | 10 |
| Cells in parallel | 4 |
| Max continuous current per cell (A) | 10 |
- 10S4P with 3.6 V 3 Ah cells: 36.0 V, 12.0 Ah.
- Energy = 432 Wh from 40 cells, delivering up to 40 A.
Result:
| Pack voltage (V) | 36.0 |
|---|---|
| Pack capacity (Ah) | 12.0 |
| Pack energy (Wh) | 432 |
| Total cells | 40 |
| Max continuous current (A) | 40 |
Frequently asked questions
What does 10S4P mean?
10 cells in series, 4 such strings in parallel: 40 cells total.
Do I need a BMS?
Yes. Lithium packs need a battery management system for cell balancing, protection against over- and under-voltage, and over-current.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.