A contactless rechargeable hearing aid system in which a rechargeable hearing aid may be optically or inductively recharged by an optical or an inductive recharger. The optically rechargeable hearing aid may have a dual purpose optical fiber that may act as a light conduit for the recharging light, and...http://www.google.de/patents/US6265100?utm_source=gb-gplus-sharePatent US6265100 - Rechargeable battery
