Question About Refurbished iPhones

is manufacture date of refurbished iphones(found decoding serial number) real date when phone built? replacement iphone starts 87130, 87 being factory , 130 being 30th week of 2011 sometime in july.

phone rebuilt in july 2011 or pre-refurb build date when sold new? seeing got phone applecare mean battery 7 months old?

 

they replace battery part of refurb process.

 

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