NOVELTY - The device has control electronics for delivering therapy and monitoring physiological signals. A stimulation generator generates cardiac pacing pulses, defibrillation shocks, and cardioversion shocks. An implantable medical device battery (254) is connected to electronics to deliver power to the control electronics, and connected to the capacitors to charge the capacitors. The battery comprises a therapeutic power of 0.11 watt for every joule of therapeutic energy delivered over life of the battery, and a therapeutic capacity density of 0.08 ampere-hour/ cubic centimeter(Ah/cc).    USE - Implantable cardioverter defibrillator (ICD) device i.e. implantable medical device (IMD), for use in an implantable medical device system i.e. therapy system, to deliver therapy to a patient to treat a variety of symptoms or patient conditions in different therapeutic applications, and to monitor physiological signals such as pacing pulses, or cardioversion or defibrillation shocks (all claimed). Uses include but are not limited to implantable pulse generators (IPGs), neurostimulators, cardiac pacemakers, electrical stimulators and therapeutic agent delivery device for delivering therapy to treat chronic pain, tremors, Parkinson's disease, movement disorders, seizure disorders i.e. epilepsy, urinary or fecal incontinence, sexual dysfunction, obesity, mood disorders, gastroparesis or diabetes in deep brain stimulation (DBS), spinal cord stimulation (SCS), pelvic stimulation, gastric stimulation, peripheral nerve stimulation or delivery of a pharmaceutical agent, insulin, pain relieving agent and an anti-inflammatory agent to a target tissue site within patient.    ADVANTAGE - The battery is provided with small volume and high power as therapeutic power and high capacity as capacity density. The device is provided with producing irregular stimulation fields with lead and complex electrode geometry so as to allow therapy system to more effectively treat certain anatomical regions of brain. The therapy system includes lead with a complex electrode array, thus reducing or eliminating side effects from more spherical stimulation fields produced. The battery enables a center of the stimulation field to be moved away from lead so as to avoid unwanted stimulation or compensate for inaccurately placed leads.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for making a battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a cut-away perspective view and an enlarged view of a portion of a battery in an IMD.    Implantable medical device battery (254)    Case (270)    Anode (272)    Separators (274)    Liquid electrolyte (278)