kshen888 Generally speaking, Abus and Kryptonite are the "big names" to consider.
For being away from the bike for a few minutes in a moderate risk area something like an Abus folding lock can be a decent compromise. They have different sizes/weights and also have a couple models with an alarm. Check the
Abus website for more info. I've been happy with my Abus Bordo 6100.
Depending on your riding you might also look at a
frame lock with an added chain.
Also - if your ebike has an Abus lock for the battery (i.e. Bosch battery), talk to your dealer about the
Abus YourPlus program in which they can order locks matched to your existing key.