Battery Cell Configuration Calculator
Design custom lithium pack cell configuration. This calculator estimates pack voltage, capacity, stored energy, and total cell count from series and parallel layout.
Custom Pack Configuration Tool
Enter cell voltage, cell capacity, series count, and parallel count to estimate lithium battery pack specifications.
Series and Parallel Pack Estimator
Use series to raise voltage and parallel to raise capacity when designing a custom lithium pack.
Calculation Results
These results show nominal pack voltage, pack capacity, total stored energy, and total cell count for the selected layout.
Educational Estimates Only: Real pack design must consider BMS compatibility, fuse protection, busbars, insulation, balancing, charge limits, discharge current, and cell matching. Always verify with datasheets for critical use.
Cell Layout Basics
Series and parallel layout determine the voltage, capacity, and final performance of a custom lithium battery pack.
Series cells raise pack voltage, while parallel cells raise pack capacity. In a lithium pack, the number before S tells you how many cells are connected in series, and the number before P tells you how many parallel strings are used. For LiFePO4, a common nominal cell voltage is 3.2V, so 4S is about 12.8V and 16S is about 51.2V.
That is why 4S1P gives about 12.8V 100Ah when using 3.2V 100Ah cells, 16S1P gives about 51.2V 100Ah, and 4S2P gives about 12.8V 200Ah. These layouts are common in LiFePO4 systems because 4S is widely used for 12V-class batteries and 16S is widely used for 48V-class batteries.
For a 48V LiFePO4 system, the usual answer is 16 cells in series for a nominal 51.2V pack. Mixing different cells in one pack is not recommended because differences in model, age, capacity, or internal resistance can create imbalance and reduce safety and lifespan.
Cell layout
- S = series to raise voltage.
- P = parallel to raise capacity.
- Common: 4S for 12V LiFePO4.
- Common: 16S for 48V LiFePO4.
Examples
- 4S1P = 12.8V 100Ah.
- 16S1P = 51.2V 100Ah.
- 4S2P = 12.8V 200Ah.
How many cells for 48V?
Usually 16 cells in series for LiFePO4 48V nominal systems. That gives a nominal pack voltage of about 51.2V when each cell is 3.2V nominal.
Can I mix cells?
Not recommended. Use the same model, age, and capacity so the pack can balance properly and perform more consistently over time.
Frequently Asked Questions
These are common questions about lithium cell layout, series strings, and parallel capacity.
How many cells for 48V?
Usually 16 cells in series for LiFePO4 48V nominal.
Can I mix cells?
Not recommended. Use the same model, age, and capacity.
What does S mean in battery layout?
S means series. Adding cells in series increases voltage while the pack capacity in Ah stays the same.
What does P mean in battery layout?
P means parallel. Adding cells in parallel increases capacity in Ah while the pack voltage stays the same.
What is 4S1P for LiFePO4?
With 3.2V 100Ah cells, 4S1P gives about 12.8V 100Ah.
What is 16S1P for LiFePO4?
With 3.2V 100Ah cells, 16S1P gives about 51.2V 100Ah.
What is 4S2P for LiFePO4?
With 3.2V 100Ah cells, 4S2P gives about 12.8V 200Ah.
Why are LiFePO4 batteries called 12V or 48V if the nominal voltage is different?
Those are class names used for compatibility. A so-called 12V LiFePO4 battery is usually 12.8V nominal, and a 48V class pack is usually 51.2V nominal when built as 16S.
Does parallel increase voltage?
No. Parallel raises capacity and current capability, not nominal pack voltage.
Is this enough to build a safe battery pack?
No. Safe pack design also needs correct BMS selection, protection devices, mechanical support, insulation, and proper assembly methods.
Design Battery Packs More Clearly
Use this calculator to plan lithium pack series and parallel layout, then compare related tools to refine battery sizing and system design.
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