kWh, explained
Battery size is your fuel tank - how to read it.
kWh is the size of your battery
A kilowatt-hour (kWh) is just a unit of stored energy. On an EV it's the single most useful number: it tells you how big the "tank" is. A city scooter might carry 2-4 kWh; a family car 40-55 kWh. Drag the slider to feel the difference:
Quick checkA bigger kWh number usually means...
Why kWh doesn't equal range
Two EVs with the same kWh can go different distances. Range depends on how efficiently the vehicle turns energy into motion — its weight, aerodynamics, your speed, terrain, even the weather. Efficiency is measured in km per kWh: a light scooter may do 35+ km/kWh, a heavier car around 6.
Quick checkWhat turns battery size into actual distance?
Putting it together
Rough range ≈ battery size (kWh) × efficiency (km per kWh). It's an estimate, not a promise — but it's a far better guide than the brochure's single big number, which we tackle next.
Quick checkTwo EVs both have a 4 kWh battery. Can they have different ranges?
You learned
- kWh = battery size (your fuel tank).
- Range ≈ kWh × km-per-kWh efficiency.
- Compare EVs on real-world km/kWh, not just kWh.