Sonobuoys - disposable submarine detection units use salt-water batteries that activate when dropped into seawater. As a bonus, when the battery power drops below a certain level, a seawater valve is opened that scuttles the units to keep them out of enemy hands... Obviously not good for long-term applications though.... Chris > Corrosion. > > -Adam > > Eoin Ross wrote: > > >Just a small thought here - why wouldn't they use two metal > plates and use the sea as the battery? Unless the load would > be too great of course. > > > >>>>dbutler@IMETRIX.COM 03/01/02 10:54AM >>> > >>>> > > Somewhere I have some data taken by the Woods Hole > Oceanographic Inststute for instruments that would run off > batteries for several years on the bottom of the ocean, > > > >Sherpa Doug > > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body