I am not too impressed with the battery that came with my new Z. I had to boost it up twice in my first 2 months of ownership. The 2nd time, the dealership ran a check and said battery was OK. Granted mine is a roadster,with the added drain playing around the power top; this factory battery appears not to hold the charge too well esp with my daily driving being fairly short distances ( less than 10 kms ) each time on my daily commutes.
The first time it happen was after a week of ownership and I attributed that to having left it in the ACC. position; as I was in a hurry getting to work and then finding the battery almost dead 9 hours later.
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