im not aware that they have a shelf life as they lose almost zilch voltage while left stored for long periods, they do however appear not to like being left fully charged for long periods
if you intend to shelf them, do a storage discharge on them if your charger allows
if bought recently from UK hobbyking there not expensive and you wouldnt get a great deal for them as there only about £23 new each
hope this helps
Fid
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