The Loss kinetics can be specified by either using a Built in expression or an User defined expression. The Built in option calculates a loss current based on a Calendar aging time constant that defines the rate of the parasitic reactions, and dimensionless aging factors dependent on Voltage, Current, Aging history, and Temperature, respectively. The loss current is used to calculate the accumulated capacity loss corresponding to the parasitic reactions.

All aging factors having the value of 1 would result in a constant capacity fade, starting from initial time, reaching 0 remaining cell capacity when the time is equal to the Calendar aging time constant, independent of battery SOC, capacity throughput, aging history and temperature.

Enable Voltage to specify the Offset potential and Transfer coefficient parameters, that relate how the rate of the parasitic reactions changes when the battery voltage deviates from the average open circuit voltage. In many battery systems, it is seen that high state-of-charge values (typically resulting in high battery voltage) accelerate capacity loss.

Battery lifetime is closely related to the amount of cycled equivalent full cycles. Enable Current to specify the Cycling capacity loss factor parameter, which defines the additional capacity loss induced by cycling. For example, a value of 2·10−4 (with all other aging factors set to 1) would result in an additional capacity fade of 20% for a cycled amount corresponding to 1000 cycles of the initial capacity.

Enable Aging history to define a decelerating aging rate. Specify the Decelerating aging factor that defines how many times the capacity loss rate will have been reduced when all capacity has been lost.

Enable Temperature to specify the Activation energy and Reference temperature parameters, in order to calculate a temperature-dependent aging factor defined using an Arrhenius expression.

The User defined option of Loss kinetics can be used to explicitly specify the Loss current.