Patent ID: 7081761

Claim:
A system for projecting the useful life Y proj of an ultracapacitor power source undergoing at least one ON period and at least one OFF period, comprising: sensors coupled to the ultracapacitor power source for measuring the voltage V(t) and temperature T(t) thereof as a function of time; and a measuring system coupled to the sensors, the measuring system receiving voltage V(t), and temperature T(t) and computing useful life Y proj based at least in part on initial values of voltage V(t), and temperature T(t)=Vo, To at the beginning of an OFF period of the ultracapacitor, final values of voltage V(t), and temperature T(t)=V f , T f at the end of the OFF period and one or more values of V(t), T(t) obtained during an ON period of the ultracapacitor.