I have used a little trick to save all the info---I usesd a cigerette
lighter adapter and hooked up the other end to a conector that was for a 9 volt battery. Put a battery in the holde and plug into the lighter. It will hold the computer and misc settings while you clean the battery post. I bought the 9 volt leads at Radio Shack--it came in a pack of 5 I think, anyway the whole thing was about 10.00. Used it many times so its paid for itself.