Powered a single microchip for six months with the chip just burning cycles for 45 minutes on and 15 minutes off. Further details not provided in article. Probably in the paper if you wanna read that.
With embedded battery, where neither depend on mined metals, both are biodegradable and non toxic, and it's carbon fixing (negative greenhouse gas impact). Yeah that's fucking groundbreaking.
You don't need a battery, just a capacitor for these levels of power draw, and you would be hard pressed to find a material that is more abundant on earth then silicon.