Not really familiar with your brand, but trust me, water is not your friend. Your gear train rusts and your electrical system goes nuts with it. I use a damp cloth to wipe down the bike and clean the chain as I would anyother time (scrubber, wipe down, lube).
I do take the battery out when I do a wipe down. I'll also use a plastic friendly contact cleaner when I suspect the battery pack may have gotten wet.
No. A pedego owner violated his warranty that way, ruining his bike.
If you can't wipe it down with non-polar solvent, auto supplies sell something called brake cleaner in a spray can. Highly flammable, no smoking, open flame, sparks, electricity turned on or off within 10 m. Everything has to be re-oiled re-waxed after using that stuff.
I've wrapped my battery with foam insulation, then covered & wrapped with a 3 mil pvc bag and taped it shut with shipping tape. The exit for the wires points down. Most pre-built bikes don't take as much care to seal the battery. I've ridden through drenching January rains, and the throttle quits working. The battery doesn't short out.
I would contact the manufacturer and ask what they recommend.
When it comes to e-bikes, it makes sense to use as little water as possible. I usually just wipe off the heavy stuff with paper towels when it's still wet and use a soft bristle brush to remove the rest after it dries. I occasionally use a damp sponge on stubborn areas.
I use a hose and wash the bike carefully with the display and battery removed. I don't use high pressure. I dry the bike with towels and when possible I leave in the sun to dry. I always give the bike hours to dry, usually overnight before reattaching battery and display.
First off, I’m not getting into rain, deep water or mud. Cleaning consists of wet microfiber wipe down, dry microfiber wipe off, and a hybrid spray wax.