If it's the original 2009 battery i'd definitely consider getting a new one. I've read that the stock batteries in the early year Z's were crap. When I bought my 2009 Z the first thing I did was buy a battery (and pulled the steering lock fuse). Believe it or not I bought a Champion from Walmart. So far it seems to be tough as nails. I left it connected to the Z all winter and it always started fine...and we had a terribly long, cold winter here in the north.
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