I'd say three years is about average if not a little better than average for the original battery based on the numerous posts regarding poor OEM battery life. Mine just died after 3 years and 2 months.
They usually don't give much warning so many owners have proactivley replaced after 2 to 3 years anyway.
I replaced with a Diehard Gold from Sears for $89. I have them in all my cars and they almost always last a minimum of 5 years. IMO cheaper batteries arent worth the risk down the road when the wife has the kids in the car.
My battery acted up on my 23 month old '04 last week. When I tried to turn it on, it would just click. But after turning off the auto headlights and radio, there was just enough juice to start the car. Has been fine since but I'm already looking into getting an Optima to replace it.
Every time I go into my local Costco I look up the battery for my '03. They never have one on the rack. What size did you get? Was this the one that was specified in their reference book or did you take measurements and get one that matched? Just curious. Thanks for your time.
My OEM battery lasted for 6+ years and almost 79,000 miles. I finally replaced it last night with Kirkland #3, group size 35 (cca 640 vs. cca 550 for the oem battery) from Costco for $64. It has 3 yr full replacement and prorated 100 month warranty.
I originally looked at Optima batteries. After doing some research I discovered that many of them die after 2-4 years of use (and apparently dry cell batteries can't be jump started). It did not make sense to pay almost 3 times more ($175) for the Optima without getting any significant benefit over the regular acid-lead battery.
In my research I discovered that "Most auto batteries are made by just three manufacturers, Delphi, Exide, and Johnson Controls Industries. Each makes batteries sold under several different brand names. Delphi makes ACDelco and some EverStart (Wal-Mart) models. Exide makes Champion, Exide, Napa, and some EverStart batteries. Johnson Controls makes Diehard (Sears), Duralast (AutoZone), Interstate, Kirkland (Costco), Motorcraft (Ford), and some EverStarts."
I have always bought DieHard batteries in the past, and they worked great. Last battery I bought almost 7 years ago (it is still going strong in my Maxima) is a Duralast Gold from AutoZone. I figured since Kirkland batteries are made by the same company (and have the same warranty) its a safe bet, especially at a lower price. No need to waste money on the Optima.
Just replaced the second OEM battery in my 2003 MDX with a redtop Optima. Wow! I'm amazed at its power and resiliancy. Deliberately ran the radio in garage this weekend for 4 or 5 hours and it didn't even make a dent in the charge. Old Acura battery would only last about 1 hour and die completely, even when new!
All in all, I switched because I was tired of having to replace prematurely dying Honda batteries. First battery lasted only 1.5 years and second battery lasted only 3.5 years. That's crap! The OEM batteries in my previous Toyota and Lexus both lasted 6-7 years. Now that I think of it, the battery in my 1985 Honda CRX also died in about 1 year. So I guess Honda has a long history of installing crappy batteries.