from my experience with ifixit parts they do specify if the part is new, used, or refurbished.
Also referring to the battery expectancy , it depends on how you care for the battery, if you take care and only charge it when you need to (%10-%15) then you should easily see 2-3 years out of this new battery. A typical LI-Ion battery has a life span of about 500-600 charges from empty to a full charge it is reccomended to replace your phone batteries once every year or every other year depending on how comfortable you are with the current battery life of your device.
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