lipo like(do they?) being warm but just because it lowers their internal resistance(more punch), not too warm though. I have not seen anywhere that it increases their lifespan to get warm for discharge.
About cold storage...a book at work... But I have to say it states that regarding Lithium-ion batteries.
Lithium-polymer might or might not be different in that respect? But I found this link googling it(seems quite serious):
http://barnson.org/node/1154