Lithium-ion batteries should generally be stored at room temperature. Storage at higher temperatures, however, reduces the service life of the battery. Lithium-ion batteries can be destroyed by temperatures above 55 °C, and can totally discharge at temperatures below -15 °C. Lithium-ion batteries should not be fully charged prior to storage. The activity in a fully-charged cell is higher than a partially-charged cell, which causes the cell to age more quickly.