Re:Never realized this.. (Score 1)

For current batch of high-load implanted devices - neuro stimulators (for pain management), rechargeable is all the rage these days. The advent of rechargeable resulted in extended product life from 2-3 years to 10 to 25 years. Of course, this is with through-the-skin recharge, so it is not quite the same thing. In a lower load situation (like pace making), rechargeable would have a life far beyond the practicle life of the rest of the device....