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Tom - I replaced mine with an Exide ORB34M-36 after about 8 years. Turns out I had a slow battery drain, not a bad battery, thus my 2003 Optima was fine. I am still using that Optima elsewhere around the house and it works fine (10+ years old). Unfortunately the above Exide battery may no longer be available (at least at Amazon). One nice thing about my Exide is that it has another set of (smaller) terminals that I leave the pigtails from my trickle charger attached to. This battery does appears available on-line but has gotten to be a bit pricey.
Hope this helps a little.
Tom
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