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.
Nissan Forums is the go to place to talk about your favorite Nissan model, including the Rogue, Maxima, Altima and even sports cars like the 370Z and 200SX.