A portable defibrillator and related methods thereof are provided. The portable defibrillator has a housing having a first housing piece separable from a second housing piece, wherein each of the first and second housing pieces has an electrode, wherein the housing has a special volume of less than about 26 inches (66 cm3), a linear three dimension sum of less than 14 inches (35.5 cm). A wire is connected between the first and second housing pieces. A battery and a capacitor are positioned within at least one of the first and second housing pieces. A controller controls release of a voltage from the battery to at least one of the electrodes of the first and second housing.
