Dissolving battery developed

Scientists at Iowa State University have developed a self-destructing battery capable of dissolving when exposed to heat or liquid.
It delivers 2.5 volts and can power a desktop calculator for 15 minutes.
It could be used to keep military secrets confidential, and in environmental monitoring devices .It measures 5mm in length, is 1mm thick and 6mm wide, and is similar to commercial batteries in terms of its components, structure and electrochemical reactions.