Portable generator powers small safety devices

https://techxplore.com/news/2022-02-portable-powers-small-safety-devices.html

"polymer material is negatively charged. The water moves up and down when the device is shaken, acquiring a positive charge that is transferred to the electrodes to generate a high electrical output... high electrical output reaching 710 volts when it had adequate space for water movement and a high electrode area... can power 100 LED lights, meaning it could be used as a traffic safety light baton that illuminates when shaken"

Related: Denyo Unveils Innovative Fuel Cell Portable Generator, A Leap Towards Sustainable Power in Singapore

https://sg.news.yahoo.com/finance/news/denyo-unveils-innovative-fuel-cell-013000983.html