Heat — Body

: Modern TEGs can power small electronics like smartwatches (e.g., MATRIX PowerWatch) and fitness trackers without ever needing a battery [6, 18].

: Heat is a byproduct of metabolism—the chemical reactions that convert food into energy [1, 17]. Body Heat

While we aren't yet powering smartphones solely with body heat, the field is advancing rapidly. Researchers are exploring and "zebra-striped" surfaces to maximize energy output [5, 35]. The goal is a world of "maintenance-free" technology where our own biological activity serves as a continuous, green power bank [1, 18]. : Modern TEGs can power small electronics like