For lithium-ion packs, a series circuit connects cells end-to-end so voltages add while current rating stays equal to one cell, whereas a parallel circuit ties all positives together and all negatives together so capacity and current rating add while voltage stays at one.
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Determine how many batteries you need in series, parallel, or both to meet your system voltage and capacity requirements. This calculator shows the required arrangement to match your target system.
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When you connect battery packs in series, you're essentially lining them up so that the positive terminal of one battery pack is connected to the negative terminal of the next one.
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A series connection links the positive terminal of one battery to the negative terminal of the next, increasing total voltage while keeping capacity constant.
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