Battery Pack Calculator

DIY Battery Pack, BMS Configuration and Cell Calculators

BatteryPackCalc is a free toolkit for designing and validating DIY lithium battery packs for e-bikes, electric scooters, EV conversions, and home power walls. Each calculator solves one piece of the build. The S/P configuration tool turns a series and parallel count into pack voltage, capacity, and energy in watt-hours; the C-rating tool converts a cell's rated C into maximum continuous current and power; and the BMS cutoff tool maps NMC, LFP, or LTO chemistry onto the over-voltage, under-voltage, and over-current thresholds your protection board should use. The nickel strip tool sizes interconnects against a conservative ampacity, while the internal resistance, charge time, and cell heat tools predict voltage sag, CC-CV charging duration, and the heat each cell sheds under load. Every result is derived from the same formulas shown in each tool's guide, so you can follow the math, plug in your own cell datasheet figures, and cross-check a design before you ever pick up a spot welder.

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Popular Battery Pack Configurations