Abstract: An electrical discharge stock prod having a circuit that prolongs battery life by monitoring power input and modifying the prod discharge characteristics. The circuit allows the prod to deliver a consistent voltage level to discharge electrodes, even though the power sources may vary. Preferably, the circuit is operated by a micro-controller. Additionally, by virtue of an improved transformer configuration (which lowers the voltage potential between the primary and secondary cores) and strategically placed polypropylene (which reduces carbon arcing) and increased isolation between primary and secondary windings within the transformer, safety of the prod is substantially enhanced. Preferably, the voltage to the discharge electrodes of the prod can be infinitely adjusted within a predetermined range of voltages, energies, and/or pulse rates to allow the prod to be effectively used on subjects having different physical parameters.