We've searched far and wide for an affordable lock that's really up to the demands of protecting a valuable e-bike, and have finally found it in the Serfas heavy duty combination U-lock. Don't worry about keys, and with the 12mm shackle + no keyhole to pick, you can rest assured your bike is safe!
Note that there is no bracket for mounting to your bike, and the lock weighs 1.8 lbs.
Like all Serfas products, lifetime warranty against manufacturer's defects!
From the manufacturer:
Unique Combination U-Lock. 4-Digit Resettable Combination. 12mm Hardened Steel Shackle. 165mm Shackle Length. Rubber coated Shackle.