Hardware #battery#battery-life
Joule Thief Circuit Reveals Hidden Energy Still Left in Dead Batteries
Rhett Allain of WIRED explains how a so-called joule thief circuit — a transformer paired with a transistor — can recover residual chemical energy from batteries that appear dead. The circuit can run a 3-volt LED on a single 1.5-volt AA battery, showing that battery depletion is not the same as zero energy.
Aug 18, 2026 1 source