Roborock E5 FCC - Manual (Page 11)

Battery and Charging
Keep the dock charger away from heat (such as heating plates).
Do not wipe or clean the charging contacts with a piece of wet cloth or wet hands.
If left unused for a long period, please store the cleaner in a cool and dry place after having it fully charged and switched
Battery pack charging temperature
it should be recharged.
Long Storage (1 year)
Storage (1 month)
Battery pack using temperature
Battery pack
storage
temperature