Battery Series & Parallel Calculator
Estimate nominal voltage, amp-hours, watt-hours and total cells for an S/P bank.
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Compare series voltage with parallel capacity
Enter one cell's nominal voltage and amp-hour capacity, then choose the number of cells in series and parallel strings. Series cells multiply nominal voltage while parallel strings multiply amp-hour capacity, so their product gives ideal watt-hours. An editable usable-energy percentage produces a second scenario without hiding the allowance.
A cell count is not a battery design
Real packs need chemistry-specific charging, matched cells, fusing, balancing, insulation, mechanical protection, conductor sizing and thermal management. Parallel connection can create very large fault currents and series strings can exceed safe touch or equipment voltage. Follow manufacturer limits and qualified electrical design rather than wiring directly from this estimate.
Frequently asked questions
What does a 4S2P arrangement mean?
It has four cells in each series string and two matching strings in parallel.
Does parallel connection raise voltage?
No. It raises nominal amp-hour capacity while series connection raises voltage.
Does the tool design protection or charging?
No. It reports ideal nominal quantities only.