A:AnswerGood luck. Having a rear hub, and only one gear, will not make it in the hills. I suggest a mid-drive motor with at least a 7 speed gear cassette.
A:AnswerLike any electrical device, you don't ever want to submerge a battery or any other component of the electrical system. Or even get them overy wet
Of course the big question here is " who would want to be out in the rain anyway on a bike?
Or who would want to ride through water deep enough to submerge the motor/hub/battery??
Final comment: this bike is not for anyone short on common sense
