For the first time, researchers power an implantable electronic device using an electrical potential — a natural battery — deep in the inner ear.

Link: http://www.sciencedaily.com/releases/2012/11/121108151730.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fhealth_medicine%2Fhearing_loss+%28ScienceDaily%3A+Health+%26+Medicine+News+--+Hearing+Loss%29