Jonathan Berry <jonathanberry3...@gmail.com> wrote: Wrist watches of course don't need such frequent replacement, but more-over > there are both kinetic and solar solutions. >
That's true. There are probably some small devices similar to wrist watches that are not moved or left in sunlight that could use a long-lived battery. I cannot think of any examples offhand. Some kind of sensor, perhaps? For cardiac pacemakers, several methods have been proposed such as: Thermoelectric from small temperature differences within the body, or piezoelectric devices https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3146093/ Itty-bitty turbines driven by blood flow! https://www.engadget.com/2011-05-17-blood-turbine-to-power-your-pacemaker-become-legendary-band-nam.html Extraction of chemical energy from blood glucose!! Russian nuclear scientists are developing a new method of generating electricity from human blood to allow pacemakers to work without replacement. https://www.rbth.com/science-and-tech/327650-russian-scientists-electricity-from-blood Creepy, eh? Just what you expect from nuclear scientists.
