It may be 1/20 of what it takes to light a LED, but it's 100 times what it takes to power a watch. A watch that lasts 5,000 years between batteries sounds attr

It may be 1/20 of what it takes to light a LED, but it's 100 times what it takes to power a watch. A watch that lasts 5,000 years between batteries sounds attractive. There are an lot of things you can do with 15 joule per day budget. Being able to do it using an failsafe energy that lasts for millennia using a would be amazing. We could literally blanket the planet with sensors that never die.