3 ms·TU Delft and RUG/UMCG develop child-friendly button cell battery4 points by Someone 3y agoSomeone 3y agoPatent application: https://pure.rug.nl/ws/portalfiles/portal/243375525/WO2022146139_A1.pdf https://pure.rug.nl/ws/portalfiles/portal/243375525/WO202214...