Should I return this EverStart Platinum battery, or put it in service

So I bought this EverStart Platinum H6 battery on Friday to replace the OEM H6 that is currently in my 2015 Cayman, and is now nearing the 9th year on this planet. Recent testing of the OEM battery is showing that is now on the brink of needing to be replaced, and the Start/Stop functionality of the car isn't taking place at all anymore, which is the first sign that the car is protecting the battery.

So, first thing I did after getting the battery home from Walmart on Saturday is hook up my...

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