Fifth Star (s initially) do not have the date of manufacture

This part is processed very valuable (thus fits Apple products for which it is optimized according to the manufacturer). The function is blameless - just load in a surprisingly short time my iPhone 5c.
However: The battery came with me to be flat; I know otherwise not - by any manufacturer - possibly it has been mounted very very long?
However, a date of manufacture is missing - very intransparent; LiIon batteries in that is a weighty quality criterion, since this age even with the simple storage.
Therefore, "only" four stars (at least) - in the hope that the battery is not ancient.
But - since bought on Amazon - I would in the event of a complaint so must reckon with a generous customer control :)

Addendum:
Capacity is well within the normal range - that's why my "fears" regarding superposition in air have dissolved.
Yet - in the interests of transparency, I would find helpful an indication of the date of manufacture of the cells - but the "wants" you probably do not really ...

By the way - there are already reputable manufacturers, which make the appropriate data: For example: Bosch - at least in the "blue" (industrial) environment of cordless tools - exemplary.

Nachtrag_01:
After several cycles, the part is genuine "in shape". The little hakeligen connections I have via silicone oil (a ** TOUCH **) on the mechanism (never on the contacts!) Get consistently.
Total - finally judged a good buy.
Thus, as of today "upgrade" to five star :)