I'll probably describe this badly but I have a wire which on one end has a plug that goes into a BMW accesssory outlet and on the other end has a fitting that connects to a Battery Tender so that you can charge your battery.
On my last service I had the techs install leads onto the battery so that I no longer need this wire, so I want it to have a good home and it is available free to the 1st person who posts with their snail-mail address.
Butt!!!! The wires to the plug are lose so that it will work but only if you position it correctly. I just hate to toss it out in case someone can use it.