The bikes are not water-proof, they are water-resistant, rated IP-65.
Please see related article: Can I wash my ebike?
While we do not recommend leaving the bikes out in the rain or riding in hazardous conditions due to personal safety, the bikes can handle water exposure.
Its important to check that the charge port and usb port (500 Series only) is completely closed off before going out in wet conditions. Failure to do so will allow water/ moisture to enter the charge port which can then destroy your battery and or cause bodily harm when the charger is plugged in.
CORE-5 & LMT'D