the first generation of Xtar 1.5V Li-Ion, blue-white AA without battery warning (that means without 1.1V phase at the end) were measured with a self discharge of around 35 % within one year at 20°C here in Germany, so 65 % of the capacity was still on board after one year of storage, which was very good at the time of testing … after two years a little less than 40 % of the capacity was left …
but these numbers cannot be generalized … there are other brands, that were nearly or completely empty after one year, with the risk of the internal Li-Ion cell having been damaged !
the current blue Xtar AA “4150 mWh” (energy of the internal 3.6V Li-Ion cell) was taken into that test nearly one year ago, so we could expect results for the self discharge within the next 3 weeks or so … when the results are published, I can post them here …