122 such that when motion is detected by accelerometer 126 timing circuitry 122 is reset if so configured the activation assembly operates to provide a control signal after accelerometer 126 detects that downhole power unit 100 has remained substantially motionless within the well for a predetermined amount of time working assembly 102 includes an outer sleeve member 150 which may be threadably coupled or pinned to housing assembly 106 at its lower end 152 outer sleeve member 150 may be threadably coupled to other tools such as a housing member of a dump bailer body shaft 130 extends through sleeve member 150 and is operable for coupling to other tools such as a piston disposed within a dump bailer body as will be described below in operation downhole power unit 100 is adapted to cooperate directly with a housing member of a dump bailer body specifically prior to run in outer sleeve member 150 of downhole power unit 100 is operably associated with an outer housing of the dump bailer body likewise shaft 130 of downhole power unit 100 is operably associated with a piston disposed within dump bailer body as used herein the term operably associated with shall encompass direct coupling such as via a threaded connection a pinned connection a frictional connection a closely received relationship and may also include the use of set screws or other securing means which may or may not be shearable in addition the term operably associated with shall encompass indirect coupling such as via a connection sub an adaptor or other coupling means as such an upward longitudinal movement of shaft.