My 04's battery lasted about 9 years before it finally died.

I even have a stereo putting a big load on it and I run it engine off quite a bit.

 

Mine was +/- 9years 2003 through 2012 - but the majority of time it wasnt on the road it was in a garage/parking structure.

 

I think I was around 75-80k miles when I replaced it.

 

I am now going to replace my OEM battery on my 04 with 49k miles. I wish I could get the OEM again. Very long life.

 

My factory battery lasted 8 years and 34K miles. I replaced it a couple months ago just due to its age. I'm still using the factory battery for bench testing parts and I keep it charged using a Battery Tender Plus.

I replaced my factory battery with another Nissan battery (more powerful, same footprint.) The Nissan battery cost less than a new Interstate unit. So far, it's been working like a champ.

 

Yesterday i though my OEM battery finally gave out, I had trouble starting the car, thought for sure it was the battery dying, long story short, P0340 error code / cam shaft sensor

So my 04 currently has 106k miles on it and still on its original battery. Talk about dependable!

 

Which Nissan battery did you get? Part number offhand? In my z I have a CCA 550 but would like something with more juice.

 

I would recommend not getting a battery with more 'juice'. Nissan OEM specifications state what battery our cars come with from factory (which is a Deka brand battery). That specific battery is rated for a specific CCA (I don't know this off hand, maybe it is 550 like you are saying you currently have). Nissan chose a battery with that cranking ability because it's in the "sweet-spot" for the battery, meaning that it will make the battery work, but doesn't over-discharge it.

Getting a battery with a higher CCA may be beneficial and seem fine initially, however in the end you will get less life out of a battery with too high of a CCA. If our cars do not discharge the battery enough, then the car will continue to keep charging the battery and that will quickly lead to an over-charged battery. Yet again, an overcharged battery is fine initially but soon after the plates in the battery will begin to expand, the casing will bulge from this expansion, the straps in the battery will get extra stress from this extra pressure in the battery, and the second a strap begins to crack, the battery will begin to short out and its quickly downhill from there.

Sorry for the lengthy response, but I wanted to back it up my answer with an explanation

 

Going on 9 years, 17.8k miles, still holding strong.

 

Replacing my battery today ... 10 years but only 19,500 miles!

 

I've replaced the battery in my '08 twice, once abut a month ago, and previously about 3.5 years ago. Florida heat is tough on a battery, though. Second was a WalMart Everstart Maxx, and I'm beginning to think the quality of their batteries had suffered lately. We've had two in my wife's TL-S, and both just barely outlived the 3-year warranty, but in the past I'd get 5 or 6 years out of one. This time I put a NAPA Premium in the Z, mostly because they were the only shop that had the proper size in stock.

 

Both your Everstart and Napa batteries are produced by East Penn (Deka). You're likely just choosing a different battery group/size/type. Hopefully your new one treats you better than your last.

Typically a very good gauge for how good the battery is, is by seeing how long the warranty is.

 

They all seem to be 3 years now, with only the real low-end cheap ones having less of a warranty.

 

Its probably just the florida heat getting to them. Most of our East Penn batteries are solid for at least 4 years. But the high heat is very hard on them so its likely that Florida is the culprit

 

'06 on oem battery here