RMIT's Proton Battery Prototype (image) RMIT University Share Print E-Mail Caption This is the RMIT-developed proton battery connected to a voltmeter. The working prototype has an energy per unit mass already comparable with commercially-available lithium ion batteries. Credit RMIT University Usage Restrictions Please credit RMIT University Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.