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Battery

Battery Series & Parallel Calculator

Calculate pack voltage, amp-hours, and watt-hours from series/parallel cell layout.

Cells in seriesS

Strings in parallelP

Cell voltageV

Cell capacityAh

Pack energy

Enter series, parallel & cell specs

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About Battery Series & Parallel Calculator

Series vs. parallel

Series adds voltage (4 × 3.2 V = 12.8 V). Parallel adds capacity (2 × 100 Ah = 200 Ah). Pack Wh = total V × total Ah.

Configuration label

A 4S2P pack means four cells in series per string and two strings in parallel—common for DIY lithium banks.

Frequently asked questions

Q: Must all cells match? A: Yes—use matched cells and a BMS rated for your series count. Q: Can I mix old and new? A: No—parallel strings should be balanced and matched.

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