“…Recently, thin and soft wearable electronics, sometime also known as skin electronics, have made significant progress in their electrical and mechanical properties and thus exhibit great potentials in healthcare monitoring, human machine interfaces, and clinical diagnosis. [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] The power management unit is one of the most important components in these skin electronic devices, as it provides and regulates the electrical power for data collection, analysis, and transmission. [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] Up to now, extensive powering technologies have been developed and used in wearable electronics, such as lithium‐ion (Li‐ion) batteries, self‐powered generators, bio‐fuel energy, and radio frequency (RF) based wireless powering strategies.…”