I'm not sure how accessible the battery is in the Z, but in the G requires some window molding/trim to be removed. A pain when it's warm outside, a big headache when it's freezing. Replaced my 4 yr old battery last fall (2015). Car still started fine (though seemed a bit slower than when new). $100 was cheap insurance not to have to do this in the middle of winter.
I didn't use any memory savers or anything. Disconnecting the terminals was the very last thing to do on the old and first on the new battery. Only had to recalibrate the one touch window auto up/down feature. I don't know if I lost presets on the radio as I only listen to mp3/bt. Other convenience settings remained untouched.
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G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring
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