One little thing I do to every battery I put in a car is write (use a Sharpie) on the top of the battery when you installed the battery. I could dig throught files to find the receipt / date, but this is quick. We've done this on boats for years.. rather handy when you talking about multiple batteries and you have no idea which is older/newer.
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My Porsche mechanic drives a Saturn.
'98 Artic Silver w/ Tip
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