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Could never bring myself to spend the money on an Optima. Just got a new pair for the Blazer today after having some issues. I've had good luck with the Duralast Gold versions from Autozone and have been running them since the mid-90's. They have a 3 year free replacement and an 8 year pro-rated warranty. The set I replaced today was right at 6 years old and had a rough life in an off-road vehicle, winching, sat around a lot between being started, and had been drained and recharged several times (sometimes the diesel is a bare to start when real cold).
Basically walked out of the store with a pair of dual terminal group 34 1000CCA batteries for the price of one, which I didn't think was bad considering the olds ones were 6 years old. Optimas were around $190 per battery.
The factory GM battery in my '03 went out after 7 years and I replaced it with whatever the Advance Auto Parts "premium" house brand is. Think I got 35% off by using a discount code online and them store pickup, and thus the reason I went that route.
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