The power source can dissolve after three weeks in water.

John Rogers, a professor of materials science and engineering at the University of Illinois at Urbana-Champaign, and his research team have developed a fully biodegradable battery that dissolves inside the body after three weeks in water. Rogers had previously led research on biodegradable electronic components that could be used in medical implants and eco-friendly smart devices. The biodegradable electronics, however, ran on wireless power from an external source and wireless power transfer wouldn’t do well with implants that need to go deeper within tissue or bone. That’s where the biodegradable battery would become more useful.

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