Storing the battery should be in a dry area, where the temperature would be around 20º Celsius. It’s not recommended to store the battery outside, or in a non-heated or humid area. Do not expose it to extremes of heat (more than 40ºC/105ºF) or cold (-10ºC/14ºF) or to damp conditions (rain, water, garage, shed, hangar or unheated basement.) It is imperative to never store a completely discharged battery. A lithium battery like Velec’s will have a slight discharge even when not in use. Storing it when it has run out of energy will damage the cells. They could no longer be usable or at best lose part of their capacity. A battery damaged due to improper storage is not covered by the Velec warranty.