Get an Optima battery and the battery minder - it's just a trickle charger that slow charges the battery to a certain voltage and then turns itself off. That's what I use in my S2000.
Agreed with others, weigh your usage and environment/climate into the equation. We will personally be replacing ours with a deep discharge battery like the Optima Yellow, since I've noticed that of recent we've been running a lot quick errands that involve one person running in while everyone else hangs out in the car with A/C on.
I bought a red top used off craigslist over 3years ago and it's still great.
A few months ago I replaced the autozone battery with an optima red top. I've left the lights on twice for over half the day and the car still started right up. I'm really impressed with how strong the red top cranks.
I use Red top Optima batteries in all my cars, I truly hate flooded lead acid batteries as they will leak at sometime in their life.
I run a Optima yellow top as well, but mine fits in just like stock.
I just threw in a red top in the G60 and it did not fit well at all. The optima website mentioned some sort of adapters that were supposed to fit on the long edges of the battery to make it fit better under the battery holder, but I did not get any with my battery. I ended up shimming it to get it snug.
I've owned an optima before. Will never buy another one. I used one in my 4x4 to listen to music while camping, play it until the sub cuts out, get a jump, charge it and repeat. Ended up damaging the battery and it would never hold a charge and struggled to start the truck after a weekend of camping. Tossed it out after 2 years.
Optima is not what it used to be. Total and utter crap.
Every optima battery I have seen in customer vehicles (I'm an auto tech) goes to crap in about 6 months to a year. I think these types of batteries are more sensitive to low voltages. They also don't hold up at all during the freezing winter months.
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