The one number the electric car investment case turns on
Battery cost per kilowatt-hour decides whether an electric car can be sold at a profit. The figure is quoted constantly and defined loosely, and cell price and pack price are not the same number.
A battery is the most expensive component in an electric car, and its price per kilowatt-hour is the number that determines whether the car can be sold at a profit. It is quoted constantly and defined loosely.
Cell price and pack price are different numbers
The cell is the electrochemical unit. The pack is everything delivered to the car: cells, the structure holding them, wiring, cooling, the battery management system and the assembly labour.
Pack price is therefore always higher than cell price, and the gap is large enough that quoting one when you mean the other changes the conclusion. When a figure appears without saying which it is, it is usually the cell price, because it is the more flattering one.
This is also why cell-to-pack construction mattered commercially rather than only technically: removing the module layer removes cost and mass from the gap between the two numbers.
Chemistry splits the figure again
Lithium iron phosphate cells cost less per kilowatt-hour than nickel manganese cobalt cells, because they use no nickel and no cobalt. They also store less energy per kilogram, so a car needs more of them for the same range.
A blended market average therefore describes no actual battery. It moves with the mix between chemistries as much as with the price of either, which is worth remembering when an average is reported as though it were a cost curve.
Where the figure comes from
The reference series is BloombergNEF's annual lithium-ion battery price survey, which has tracked volume-weighted average pack and cell prices since 2010. It is the number most other coverage is ultimately citing, and it is published once a year.
Two things to check before using any figure from it. First, whether the quote is the pack or the cell average. Second, the year: prices in this market have moved sharply and in both directions, so a figure two years old is not a current number, and a figure quoted without a year is not usable at all.
Raw material prices sit underneath all of it. Lithium, nickel and cobalt are traded commodities, and a battery price series is partly a commodity price series wearing a technology label.
Sources
Terms defined here
- Cost per kWh
- The price of a battery divided by its energy capacity, the standard unit for comparing batteries across sizes. Quoted at either cell or pack level, which are materially different numbers.
- Pack price
- The cell price plus the module and pack hardware, wiring, thermal management, battery management system and assembly. Always higher than the cell price.
Related reading
Hybrid, plug-in, range extender: where the engine actually connects
Three drivetrains sold under one word. The difference that matters is whether the engine can drive the wheels at all, and how much battery sits behind it.
Updated 17 Sept 2026 · Explainer · 2 min
Chinese EV brands: who owns what
Denza, Yangwang, ONVO, MONA, Zeekr, Lynk & Co, MG, Avatr. Most of the names arriving in Europe belong to seven groups, one of which also owns Volvo, and one phone company that owns no carmaker at all.
12 Sept 2026 · Deep dive · 10 min
What EV gross margin actually measures, and why the Chinese makers report it differently
XPeng's gross margin rose from 17.3% to 20.7% over a year in which its cars got less profitable, not more. Both numbers come from the same filing. Here is how that works.
12 Sept 2026 · Deep dive · 8 min
More on CATL
From cell to pack, and what cell-to-pack took out
A car battery is built in three layers, and each one adds mass that stores no energy. Removing the middle layer is why a pack figure and a cell figure have moved apart.
Updated 17 Sept 2026 · Explainer · 2 min
What a 70 per cent warranty floor actually commits a maker to
Batteries lose capacity through two separate mechanisms, only one of which is driving. Here is what degrades a pack, what a state-of-health figure means, and what the standard warranty does and does not promise.
Updated 17 Sept 2026 · Explainer · 2 min
LFP vs NMC: the two battery chemistries that split the EV market
An LFP pack cost $81 per kWh in 2025. The nickel equivalent cost $128. That $47 gap explains most of what has happened to electric car prices, and to the league table of who builds the cells.
12 Sept 2026 · Deep dive · 6 min
More on BYD Co
Q3 deliveries: NIO and BYD grew by double digits, XPeng and Li Auto did not
NIO delivered 109,178 vehicles in the third quarter (+25.4%) and BYD sold 1,323,065 (+18.7%). XPeng's 118,390 was up 2.1% and Li Auto's 99,964 up 7.2%. The growth came from NIO's premium brand and BYD's exports.
1 Oct 2026 · Analysis · 6 min
Q3 guidance scorecard: three hits, and Li Auto finished 36 vehicles from its ceiling
NIO, XPeng and Li Auto each delivered inside the third-quarter range they gave. NIO landed 39.3% of the way up its range, XPeng 56.5%, Li Auto 99.3%. All three set their ranges with part of the quarter already delivered.
1 Oct 2026 · Analysis · 6 min
An electric motor, a petrol engine and a diesel engine, measured on efficiency
The three drivetrains differ in how much of their fuel reaches the wheels, where their torque arrives, and how many parts they need to do it. The efficiency gap is the largest of the three, and the least discussed.
Updated 17 Sept 2026 · Explainer · 2 min