Battery Pack Configurator

The tool calculates total pack voltage (V_pack = V_cell × S), total capacity (C_pack = C_cell × P), total energy (E = V_pack × C_pack / 1000 in Wh), and maximum continuous discharge current (I_max = C_cell × C-rate × P / 1000 in A). It also infers minimum BMS voltage rating and current handling requirements.

It’s used to design battery packs for drones, e-bikes, portable power stations, robotics, and UPS systems. Engineers use it to balance voltage needs (via series count) with runtime and current demands (via parallel count), ensuring compatibility with motor controllers, inverters, and protection circuitry.

Series connections increase pack voltage while preserving cell-level capacity; parallel connections increase total capacity (and current capability) while maintaining the same voltage as a single cell. A 3S2P pack uses three cells in series per string, with two such strings connected in parallel.

Use 3.2 V for LiFePO₄, 3.6–3.7 V for NMC/NCA lithium-ion, 3.8 V for high-voltage LiCoO₂, and 1.2 V for NiMH. Always refer to the cell datasheet — entering an incorrect nominal voltage will skew all voltage- and energy-related results.

The C-rate reflects how quickly a cell can safely discharge relative to its capacity (e.g., 10C = 10× capacity in amps). Drones and power tools often require 10–30C; EVs and energy storage typically use 1–3C. Exceeding the cell’s rated C-rate risks overheating, voltage sag, or reduced cycle life.

Verify units: cell capacity must be entered in mAh (not Ah), and nominal voltage in volts. Energy is computed as (V_pack × C_pack) / 1000 → Wh. Also ensure S and P values reflect actual physical configuration—not theoretical or over-specified counts.

The tool indicates minimum required BMS voltage range (based on S × V_cell × charge/cut-off margins) and minimum continuous current rating (based on I_max). Always add 20–30% headroom to both specs and confirm cell balancing, temperature monitoring, and protection features match your safety requirements.

No — the Battery Pack Configurator assumes identical cells in both series and parallel groups. Mixing chemistries, capacities, ages, or internal resistances violates safe battery management principles and can cause imbalance, accelerated degradation, or thermal runaway.

This tool provides room-temperature nominal calculations only. Real-world capacity drops at low temperatures, and voltage sags under load increase with heat. For critical designs, derate capacity by 10–25% and validate performance across your operating temperature range using cell datasheets.

Nominal capacity (entered in mAh) is the rated capacity at standard conditions. Usable capacity is lower — typically 80–90% of nominal — due to BMS low-voltage cutoffs, temperature limits, and aging. This tool outputs nominal energy; subtract ~10–20% for realistic usable energy estimates.