Energy densityWh/kg
Energy density shows how much energy the battery stores per kilogram. It matters because the battery sets the car's range ceiling, charging behaviour, weight, price and long-term risk. Read the number together with chemistry, cooling, usable capacity and warranty.
How to compare it
Higher density helps range and weight, but durability, cost, safety and charging speed are part of the same tradeoff.
- Start with usable capacity, not only gross capacity.
- Connect pack size to consumption and charging curve.
- Read chemistry and warranty before judging long-term value.
What changes it
Battery figures move with pack design, chemistry, buffer size, temperature control and the car maker's software limits.
- Chemistry affects cost, durability, cold behaviour and charging habits.
- Cooling affects fast charging and repeated high-load use.
- Buffers affect usable energy and long-term protection.
Common trap
Cell-level energy density and pack-level energy density are different. Cooling, casing and electronics add weight.
- Bigger packs can hide worse efficiency.
- Gross and usable capacity are not interchangeable.
Energy density: inside the pack
The useful number is shaped by cell chemistry, hidden buffers, cooling and the warranty strategy.
Energy density across EVRadar
Based on 91 published cars
Lowest
65 Wh/kg
Typical
146.8 Wh/kg
Highest
205 Wh/kg