Bought a pack of 32 as the price was pretty good. What I received was a bit of a mixed bag of nuts. They were all Duracell, but they had a wide range of use by dates. 1 pack had 6 months left. Whilst the battery can still perform, it does suggest that they have been sitting in a factory somewhere for a couple of years. I used these batteries first in an LED light that took 8 cells. They performed OK and were still working past the use by date. I regularly use this light in my garage and in fairness, they lasted as long as I would expect a decent battery. I used another pack as a replacement and these were well within the use by date. About 1 month in, the light was playing up and not switching on. I found a bad cell that had leaked and corroded a battery terminal. I replaced the one cell, cleaned the terminal and all was working again (and still is).
A Third pack was used for various remote controls and again I had one bad cell that started to swell and leak slightly. The forth pack is in storage. I tested them this morning to find 1 cell was flat, but others were fine. I wondered if the cells that leaked were flat when used and were compensated by the other cells.
I guess it could be argued that 3 bad cells out of 32 isn't bad, but I paid for 32 cells and expect them all to work. Apart from that, the good cells worked as expected and performed as Duracell promise.