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Do you have the TRD package with the upgraded battery?
Do you have the TRD package with the upgraded battery? I think its a pretty good battery for OEM, and mine has held up well so far under the load of a number of accessories, including the winch. But I've been having the same thoughts as you, although they have been somewhat postponed after I installed the 2nd battery. Have you noticed any reduction in starting performance? Do you cycle it frequently, or run your winch fairly often?
It's a tough call - a good OEM battery can last 5-6 years (or more?) like our old Subaru. Or in my wife's case, the battery in her car died completely at 3 years. The battery can be the single most important piece of equipment in your rig, so having something you trust is good for piece of mind....
Not to detract from the original question, but if my memory serves me right, if you have the tow package you also get a better battery. Not just the TRD models. Correct me if I am wrong. I don't have a TRD package, but I did get the tow package and I know my battery is larger then what came standard.
It's the upgraded battery. Starts great and no problems since running the winch a few times. I think it's a good battery, but after three years I think it's on the downhill side of the longevity curve.