Did you know that if the fob battery fails you can still start the car by inserting your fob into the slot in the dashboard, by your right knee?
However, if the Steering Lock Module fails (and they do), it's often pretty terminal and very expensive.
Yeah - Jeff's absolutely right to suggest you try the battery first - and he's also right to recommend that you use something like Duracell.
...and his idea of keeping a spare in the glove box is good too!
Nice one! Thanks for posting the pics. I've got a real soft spot for the 350z's and the HR is definitely the one I'd go for.
Changing the gearbox oil sounds like a good idea. What part of the country are you in?