I would recommend the ABUS Bordo Granit X-Plus it folds up really nice and comes with a carrying case that can easily mount to the bike and it is very high security. I have sold quite a few with e-bikes and with nicer regular bikes or people locking up for a while. Having too small of a shackle makes it hard to lock to certain things and with e-bikes generally being a bit thicker and bigger it can be hard to use the smaller shackles. The New York STD would be a better shackle length choice but I would again go to the ABUS Granit X-Plus locks for best security. Their nicer stuff is made in Germany from virgin steel that has been specially treated to be very strong and fairly light as well. Also they use double locking mechanism so you have to cut through both sides of the lock unlike other lock brands that just lock to one side.