Battery capacity is the number that buys you range, but it is written in three different dialects on Vietnamese spec sheets: kilowatt-hours, volts-and-amp-hours, and the practical shorthand of “how many batteries”. Here is how to read all three.
Kilowatt-hours: the fuel-tank measure
A kilowatt-hour (kWh) is a fixed quantity of energy — the electric equivalent of litres of petrol. VinFast’s published figures make the scale easy to see: the Amio carries a 1.024 kWh LFP pack for up to 65 km of claimed range, while each removable scooter pack holds 1.5 kWh, and the Evo claims up to 165 km carrying two of them. More kWh, more range, more weight to carry and charge.
Volts and amp-hours: the same thing, factored
Dat Bike specifies the Weaver 200 battery as 72 V 68 Ah. Multiply the two — 72 × 68 = 4,896 Wh, roughly 4.9 kWh. That is the honest way to compare it with VinFast’s kWh figures: the Weaver 200’s pack holds roughly three times the energy of one VinFast swap pack, which is how a 6,000 W machine with 200 km of claimed range at 35 km/h is possible. When a spec sheet gives only V and Ah, multiply before comparing.
“Batteries” as a unit
The VinFast swap system adds a third dialect: the number of removable 1.5 kWh packs on board. One pack halves the Evo’s claimed range versus two; carrying a charged spare is the same as carrying half a tank. The swap economics — 9,000 VND per battery per swap, rental at 175,000–300,000 VND per month — make packs something you rent or own, not just a sealed component.
What capacity does not tell you
- Range claims are manufacturer figures under standard conditions; hills, load, speed and cold shrink them (our real-world range guide explains how much).
- Two packs of equal kWh behave differently if the chemistries differ — see the LFP vs lithium-ion comparison.
- Capacity fades with age, so a used bike’s real capacity is a health question, best assessed with the checks in our battery health guide.