Researchers at the Tianjin University of Technology in China have developed a new type of battery that runs on oxygen in the body and never runs out of power. They note that there may be wide-ranging uses for this technology, including fighting cancerous tumors.

Resources and links:

Academic Abstract, CHEM
https://www.cell.com/chem/fulltext/S2...

Research press release to Eureakalert
https://www.eurekalert.org/news-relea...

Chinese researchers develop implantable battery powered by oxygen in the body
https://interestingengineering.com/en...