An electric motorbike has no carburettor, no clutch and no gearbox, yet it still comes down to three parts doing the work: the battery, the controller and the motor.
The battery
The battery is the fuel tank. Most Vietnamese electrics use lithium chemistries — LFP (lithium iron phosphate) for VinFast’s swappable 1.5 kWh packs, chosen for safety and cycle life, and a 72 V 68 Ah lithium-ion pack on the Dat Bike Weaver 200. Voltage and amp-hours together set the energy available; the rider sees it as range.
The controller
The controller is the throttle’s translator. It reads your twist grip and meters battery current to the motor, smoothly, in both directions — including feeding energy back during braking. Dat Bike builds its own ESC controller, tuned for Vietnamese road conditions.
The motor
Most city electrics use a brushless DC (BLDC) hub motor built into the rear wheel — no chain, no belts. VinFast’s Evo uses 2,450 W, the Feliz II and Viper use 3,000 W versions; the Weaver 200 uses 6,000 W. Power roughly maps to acceleration and licence class: 4 kW is the legal boundary between mopeds and motorcycles.
Regenerative braking
When you close the throttle on a machine like the Weaver 200, the motor becomes a generator, returning energy to the pack while slowing the bike. Dat Bike’s system makes the regen force proportional to how much you release the grip.
What this means day to day
Fewer wearing parts than a petrol bike — but the parts that remain are expensive and mostly sealed. Your maintenance is battery care, brakes and tyres, and your habit change is charging instead of refuelling. Electricity costs per kilometre stay low; the planning cost — remembering to plug in — is yours.