Abstract: A removable keyless security lock for a light electric vehicle which employs existing permanent magnet brushless motor or motors that is or are programmed to produce high resistance to paddling to prevent theft. This antitheft mode offer resistance to motor rotation, thereby effectively locking the movement of the electric bicycle. An external energy source, such as, a battery is not required to keep the antitheft mode activated. The security lock is easily removable without using any tools and this will not deactivate the antitheft mode.