A single-handle cordless internal defibrillator includes a pair of paddles, and a pair of electrodes that are respectively connected to a first-end portion of the pair of paddles. The pair of paddles has a second-end portion in communication with a single-handle, with a least one paddle of the pair of paddles being pivotable about a pivot arranged between the one paddle and the single-handle. A regulator arm in communication with the pivot adjusts the pivot of at least one paddle about the pivot so that the distance between the electrodes is variable by moving the regulator arm, and defibrillator circuitry is arranged within the single-handle. A dual-handle structure also provides tangle-free and clutter-free applications as the defibrillator circuitry is self-contained in the handle/handles or paddles of the defibrillator, eliminating the need for long cables which obstruct and can contaminate an operating room.