Batteries used for implantable cardiac rhythm devices are described herein. Fully implanted cardiac rhythm devices, pacemakers, and defibrillators treat patients with various cardiomyopathies. Each of these devices contains a battery that supplies all of the energy for device functions. As devices were developed with increased longevity, more features and reduced size, batteries were designed with considerably greater energy and power. New battery concepts resulted in smaller, highly reliable batteries with greater power output and longevity.
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