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Recently purchased a iFixit replacement battery for my Mac Book Pro, when I checked the properties in Coconut battery app, it shows the battery is 400days old but the cycle count is 0. Is this something matter?

It doesn’t really matter that much, if you got the battery charged about 2/3 and behavior is correct, a good quality and properly stored battery shouldn’t suffer and up to 12 months storage before sale is quite common.