What is the correct way to store Li-ion batteries?

Li-ion batteries should be stored at room temperature. Storage at higher temperatures reduces the lifetime of the battery. Li-ion batteries can be destroyed by temperatures above 55 °C, and can suffer deep discharge at temperatures below –15 °C. Li-ion batteries should not be fully charged prior to long-term storage. The activity in a fully charged cell is higher than a partially charged cell, which causes the cell to age more quickly.