I do keep my storage batteries in the refrigerator; I don't know what the numbers are, but it goes without saying that as a battery cools, the reaction within it slows, thus more storage life.
My father worked at a pro camera store for many years, they would place storage/unstocked film and batteries in a basic home refrigerator in the back room. So if you buy your batteries from a professional enough business, they've already been stored in a fridge..