The performance of an electric bike is measured by its ability to climb hills and how far it will run on the flat at a constant speed. This depends on a light frame, low friction and a highly efficient electric motor but also on the energy stored in the battery, which is the fuel for the motor
In a battery of specified voltage (V), energy stored is measured in ampere hours (Ah). This measure indicates how many hours a battery can produce a fixed current – amps A.
The best electric bikes today use 36 V batteries rather than the 12 V familiar to us in car batteries. To produce the same power measured in watts, which is volts times amps (V x A) a higher voltage motor of the same power will need less current. A lower current allows the use of thinner lighter wires and a lighter motor to deliver the same power.
The FreeGo, LifeCycle and 3e electric bikes have been designed with 36 V batteries. These have a capacity of either 8Ah, 10 Ah for the lithium ion battery or 16 Ah for the lighter lithium polymer battery, which is often claimed to be 17.5 amps. So, in theory, they produce 288watts, 360watts and 576 watts respectively. The ranges of electric bikes we supply are fitted with 200watt or 250watt electric motors, which is the maximum permitted for road use in the UK. The combination of the high voltage 36 V X 16 (17.5) Ah battery gives our FreeGo Eagle and The LifeCycle Alpine Sport, Mountain Sport and City Sport the best range, best performance and hill climbing ability
The Batribike Breeze has a 36V X 8Ah battery and a 250watt motor
Nearly all our other bikes have 36V X 10Ah batteries and 250 watt motors