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I know somebody was looking for this a couple weeks ago.
Computer Memory Saver
Prevents memory loss on digital radios, clocks, door locks, and computers when disconnecting vehicle battery. Plugs into cigarette lighter socket. Uses a 9V battery to keep "memories" alive for up to four continuous hours. http://buy.snapon.com/catalog/search.asp?partno=YA960
Hey that was me looking for that. Now I am done with my sub install so I dont know if I will be disconnecting the battery anymore....but if I have to I will def. order that. Great find thanks!!