And you should have a larger battery!
2007 & 2008 G37's had a 24F. That's the size of the battery tray. Then they saved a dollar, downsizing to 35.
My 2009 is a bit of a garage queen. The first three 35's sulphated badly and finally for Battery #4, I put in a 24F.
The electronics draw almost 50 mAh. That puts a significant drain after sitting a week or so. The 24F is about 10% more capacity on average. It has helped keep a higher charge state.
Also, Bose Studio on Wheels sucks power when cranked. I have rendered the car un-startable after 25 minutes on a "good" 35 Nissan battery. (They suck.) A 24F gives a bit more leeway.