I have read that the life of this type of battery is measured in re-charges, not years. So sitting on the shelf is not a major issue. I also see Energizer and Durocell Lithium AA batteries saying they guarantee 10 years on the shelf.
I have D-Li90s with various dates. I think the oldest is 2011 or 2012. I've never tested, not going to use up the shutter actuations to do it, but I do not notice any difference in battery life between the old ones and new one that came with the K-1.
I did acquire a number of off brand ones with a K-01 I bought years ago. Never heard of any of the brand names. All of them failed within a year of my purchasing them.
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