A method for electrically initiating an inertial igniter for a munition. The method including: generating a voltage over a duration of an acceleration of the munition; directing a portion of a charge resulting from the voltage and duration to an electrical storage device on board the munition; determining by a circuit, whether the acceleration experienced by the munition is an all-fire condition based on both the voltage and duration of voltage generation and a predetermined accumulated voltage of the electrical storage device; and providing the predetermined accumulated voltage to an initiator when the all-fire condition is determined.