// multi-utility computation suite · offline · instant · precise
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eng.battery-state-of-health Calculator
Calculates battery State of Health (SOH) from measured vs. nominal capacity, and estimates remaining useful life from degradation rate. SOH below 80% is the typical replacement threshold for EV traction batteries — capacity fade accelerates above 80% discharge depth and above 40°C.
Inputs
Q Current Ah
Maximum throughput or storage. Operating near 100% capacity typically increases failures and wait times.
Q Nominal Ah
Maximum throughput or storage. Operating near 100% capacity typically increases failures and wait times.
R Current Mohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
R Nominal Mohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Cycles
Reference formula or conversion factor shown for context.
Results
SOH (capacity-based)
Reference formula or conversion factor shown for context.
SOH (resistance-based)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
combined SOH estimate
The value at the specified point or condition.
end of life (80% threshold)?
Sample size or count used in the calculation.
SOH = Q_current/Q_nominal × 100%
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.