Kirland Brand battery review

My Kirkland brand battery is just entering its 3rd year and 4th month of service and is starting to show signs of weakness. With all accessories and lights running I notice all the lights dim a bit when I disengage the clutch while coming to a stop. It's a momentary surge but I'm sure it's putting undue pressure on the alternator. A load test proved it is weakening a bit.
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Have a Kirkland Signature battery in my 2004 Chevy Cavalier with 133k miles. Sticker shows the battery made 7/11 and I bought it August 2011. Almost 6 years later, it's mostly working but starting to wane.
Ohioan on 4/25/17