Battery Pack Series/Parallel Calculator
From cell parameters and the S/P arrangement, compute pack voltage, capacity, energy, internal resistance and maximum continuous current — the 13S4P and 4S2P view at a glance.
Key points
Battery Pack Series/Parallel Calculator: From cell parameters and the S/P arrangement, compute pack voltage, capacity, energy, internal resistance and maximum continuous current — the 13S4P and 4S2P view at a glance. Formula: V = S·Vcell ｜ Ah = P·Ahcell ｜ R = S·Rcell/P ｜ Wh = V·Ah. Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. Match cells (same maker, batch and resistance) before connecting in series — the weakest cell sets the whole pack capacity. The C-rate is a cell figure; paralleling increases capacity but the share per cell stays the same, so the pack C-rate equals the cell C-rate.
Inputs
V = S·Vcell ｜ Ah = P·Ahcell ｜ R = S·Rcell/P ｜ Wh = V·AhCalculation model (updates with parameters)
| Pack voltage | 14.80 V | 4S × 3.70V |
| Pack capacity | 5.000 Ah | 2P × 2.50Ah |
| Total energy | 74.0 Wh | 0.074 kWh |
| Pack internal resistance | 60.00 mΩ | S·Rcell/P |
| 1C Discharge最大Current | 5.0 A | |
| Max continuous output power | 74 W | |
| Full / cut-off voltage | 17.8 V / 12.6 V | Rough estimate at 4.2V / 3.0V per Li-ion cell |
Engineering notes
- Match cells (same maker, batch and resistance) before connecting in series — the weakest cell sets the whole pack capacity.
- The C-rate is a cell figure; paralleling increases capacity but the share per cell stays the same, so the pack C-rate equals the cell C-rate.
FAQ
- What is Battery Pack Series/Parallel Calculator for?
- From cell parameters and the S/P arrangement, compute pack voltage, capacity, energy, internal resistance and maximum continuous current — the 13S4P and 4S2P view at a glance.
- What is the formula for Battery Pack Series/Parallel Calculator?
- Core formula: V = S·Vcell ｜ Ah = P·Ahcell ｜ R = S·Rcell/P ｜ Wh = V·Ah. The tool returns results instantly using this formula and the selected parameters.
- What engineering notes should I keep in mind when using Battery Pack Series/Parallel Calculator?
- Match cells (same maker, batch and resistance) before connecting in series — the weakest cell sets the whole pack capacity. The C-rate is a cell figure; paralleling increases capacity but the share per cell stays the same, so the pack C-rate equals the cell C-rate.