An ebike, also known as a power-assisted bicycle, is essentially a bicycle with a motor. It is a bicycle that:
.has a maximum weight of 120kg (including both weight of the bike and the battery);
.has wheels with a diameter of at least 350mm and width of at least 35mm;
.must be equipped with at minimum 2 independent braking systems for each tire;
.the brakes must be able to stop an ebike traveling at top speed (32km/h) within 9 meters of application;
.all electrical terminals must be completely insulated or covered;
.battery and motor must be securely fastened to the ebike;
.has steering handlebars and is equipped with pedals;
.the pedals must be equipped at all times without exception;
.is designed to travel with no more than 3 wheels with contact to the ground;
.has one or more electric motors no greater than 500w;
.if operable via a throttle, the motor ceases when brakes are applied
.is incapable of providing further assistance above 32km/h on level ground
.has not been modified to produce more than 500w and to travel faster than 32km/h
There are various styles of ebikes, from conventional bicycles to scooter types. Regardless of style, an ebike is only classified as an ebike so long as it meets the definition of an ebike as listed above. Being classified as a bicycle, most of the road rules and regulations pertaining to bicycles also apply to an ebike.
Anyway,you have an ebike,you need a Ebike Battery.