The invention relates to a lead storage battery extender, belonging to the technical field of lead storage battery protection devices. Comprises a reference circuit consisting of a voltage regulator D3 and a diode D2, an LC oscillation circuit consisting of an inductor L 1 and a capacitor C4, a signal trigger circuit consisting of a triode Q 1 and a first Schmitt trigger of an IC, a pulse shaping circuit consisting of other five Schmitt triggers, a feedback circuit consisting of another steady state of the five Schmitt triggers and a MOSFET, wherein the reference circuit is connected with the oscillation circuit, The oscillation circuit is connected with the trigger signal circuit, which is connected with the reference circuit and the pulse shaping circuit respectively, and the pulse shaping circuit is connected with the reference circuit and the feedback circuit. The delay generator has good working stability and high working efficiency, and can stabilize the battery capacity of the lead-acid battery or restore the normal working state in a short time. The 1. lead storage battery delay generator comprises a reference circuit, an oscillation circuit, a trigger signal circuit, a pulse shaping circuit and a feedback circuit, and is characterized in that the delay generator comprises a reference circuit consisting of a voltage regulator D3 and a diode D2, an LC oscillation circuit consisting of an inductor L 1 and a capacitor C4, a signal trigger circuit consisting of a transistor Q 1 and a first Schmitt trigger of an IC. A pulse shaping circuit composed of five other Schmitt triggers, a feedback circuit composed of another steady state of the five Schmitt triggers and a MOSFET, a reference circuit connected with an oscillation circuit, an oscillation circuit connected with a trigger signal circuit, a trigger signal circuit connected with a reference circuit and a pulse shaping circuit respectively, and a pulse shaping circuit connected with a reference circuit and a feedback circuit.