Well, it is very evident that you have an electrolytic cell, powered by the battery itself, which will be at least partially discharged by this procedure, as well as causing anodic corrosion on the +ve lead. You certainly have contamination, called water. To put it bluntly, whatever he is doing and for whatever purpose is just plain stupid. To compound this, are the batteries designed to discharge at 70°C? I doubt it. And to cap it all, applying ultrasound to water at 70°C is a pretty useless exercise, as cavitation energy is inversely proportional to temperature, as more water vapout "softens" the cavities, which will not implode so readily or as effectively. If you wish to clean sealed batteries, I would recommend a cold non-polar solvent. Brian Arbour, Michel wrote: > Hello technet, > One of our customer reported a problem with a lot of battery but we are > confused as how to interpret the results. > The battery if a full metal casing with the negative lead spot welded to the > casing while the pos. lead connects inside.The visual aspect of the leads > are excellent. > The test consists to dip the component in a stainless steel ultrasonic bath > containing de-ionized water at 70C. The part is lying on a nylon net. > The positive lead of the battery gets darkened after 5 minutes in this bath. > Only the positive pin gets dark (oxydized) > > Are we in the presence of an electrolytic reaction?? > Is it contamination of the positive lead that cause this reaction ? > Any other test to suggest ? > > Regards > MIchel Arbour > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------