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. 2022 Jan 28;9(9):2104635. doi: 10.1002/advs.202104635

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© 2022 The Authors. Advanced Science published by Wiley‐VCH GmbH

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Demonstrations of the sweat‐activated battery (SAB) in powering flexible lighting electronics for safety night running. a) The schematic diagram of a runner wearing a sweat‐activated flexible battery powered LED warning sign for safety night running. b) The schematic diagram of the flexible lighting electronics powered by the removable battery. c) The exploded view of the flexible lighting electronics. d) Optical image of the lighting electronics with a thin polydimethylsiloxane (PDMS) layer encapsulation on top. e) Optical images of the lighting electronics with the sweat‐activated battery cell mounted onto a volunteer's upper arm. f) Current flow to the LED array with under a stabilized voltage of 3 V. g) Optical images of the lighting electronics powered by the flexible battery at 0, 1.5, 5, and 8 h.