If you aren’t using your eBike during the winter, follow these storage instructions: Excessive heating and direct sunlight must be avoided. Bosch batteries and chargers must not be stored in the vicinity of heat sources or flammable materials. Bosch recommends disconnecting the battery from the eBike for storage purposes and storing it in a room fitted with smoke detectors. Dry locations with an ambient temperature of roughly 68F/ 20C are the most suitable. Bosch batteries must not be stored below 14F/ -10C or above 140F/ 60C.
The eBike itself can be stored outside, provided it is protected from snow and rain. The best option, however, is a garage, shed, or basement.