Electric bicycles use rechargeable batteries, electric motors and some form of control. Battery systems in use include lead-acid, NiCd, NiMH and Li-ion batteries. Romai uses lead-acid battery.
Range is a key consideration with electric bikes, and is affected by factors such as motor efficiency, battery capacity, efficiency of the driving electronics, aerodynamics, hills and weight of the bike and rider. The range of a Romai electric vehilce is usually stated as somewhere between 7 km (uphill on electric power only) to 65 km (minimum assistance) and is highly dependent on whether or not the bike is tested on flat roads or hills. Romai also uses regenerative braking, the motor acts as a generator to slow the bike down prior to the brake pads engaging. This is useful for extending the range and the life of brake pads and wheel rims.
The energy costs of operating electric bicycles are small and riding an electric bicycle to work or to the store instead of taking a car has long term financial and health gains.
Protection logic for over-voltage, over-current and thermal protection