What CATL and Octopus actually presented
At last week's IAA Transportation in Hanover, CATL showed TECTRANS II, a new commercial-vehicle battery designed to be modular enough to serve as a shared platform for different truck makers. The headline figures: 170 Wh/kg gravimetric energy density, roughly 13% above what CATL calls the industry average; up to 0.6 tonnes of extra payload at the same battery capacity; a maximum configuration of 1,000 km of range; 80% charge in 25 minutes on megawatt-class charging; and a claimed 96% system round-trip efficiency, which CATL credits to the first full-tab, low-impedance design of its kind.
Swaptopus is the joint venture between CATL and Octopus Energy first unveiled in June at Octopus's Energy Tech Summit. In full operation, the partners say the network could support more than 300,000 electric trucks and unlock over £30 billion — around €35 billion — in private investment. CATL also signed a memorandum of understanding with DHL Group, which targets net-zero logistics emissions by 2050, bringing in mobile charging and battery storage specialists Quibo Energy and FleetBoost — whose FleetBooster trailer packages CATL cells into a movable power plant for sites with no grid connection.
"Commercial vehicle electrification will unfold over more than a decade," said Zhu Lingbo, CTO of CATL's Global Business Unit. Akin Li, executive president of CATL Overseas Business, described the goal as matching real logistics demand with vehicles, charging, storage and swapping together.
The minutes are not where the money is
Battery swapping is usually sold on time. When we looked at Isuzu's seven-minute swap trial for Elf electric trucks in Thailand, our maths landed on €17 per truck-hour — the unit fleets actually budget in. So run a 1,000 km day: two charging stops of 25 minutes means about 50 minutes at the plug, against two swaps of roughly five minutes each. That saves around 40 minutes, or about €11 per truck per day by that yardstick. Real, but hardly the jackpot.
The prize is elsewhere. A truck that swaps packs can run a smaller battery, and every kilogram saved is payload the operator gets paid for. Packs can then be recharged slowly overnight on a modest depot connection instead of pulling megawatts from a motorway substation at 3 p.m. That is where the cost gap lives: roughly €0.20 per kWh on a depot tariff against €0.50–0.60 per kWh at a public high-power charger. A 40-tonne truck burns about 30 litres of diesel per 100 km (roughly €43–45) and uses about 130 kWh per 100 km — around €26 at depot rates, but €65–78 on the road. You can put your own figures through our EV charging cost calculator.
The number worth putting on a poster: 96%
Round-trip efficiency sounds like an engineer's footnote, but it compounds — and the 96% here is CATL's own claimed figure, not an independently measured result, so treat it as a target rather than a verified number. On that claim, you draw about 500 kWh to put 480 kWh into the truck — 20 kWh lost. At 90%, a figure typical of ordinary charging setups, you draw about 533 kWh and lose 53 kWh. That 33 kWh gap, five days a week at €0.20 per kWh, is roughly €6.60 a day — about €1,700 a year per truck. Across 1,000 vehicles, that is about €1.7 million nobody has to spend.
The comparison assumes the truck takes on board roughly 480 kWh per day — a regional duty cycle of some 370 km, not a full 1,000 km day, which at 130 kWh per 100 km would need about 1,300 kWh and therefore far more than the two 25-minute megawatt stops described above could deliver. Read the 20 versus 53 kWh loss gap in that light: it is a statement about depot-scale daily throughput, not about long-haul energy demand.
The same percentage in a family car is almost invisible: we calculated that Porsche's 11 kW wireless charging, which runs at about 90% efficiency, costs its owner some €83 a year in losses. Two percentage points of efficiency is pocket money in a driveway and a line item in a fleet.
What is still missing
Swapping only works if the pack fits every truck. CATL calls TECTRANS II modular and universal, but a European swap standard accepted across Volvo, MAN, Scania, DAF and Mercedes-Benz does not exist yet. Then there is the question of who owns and insures the battery: a swapped pack travels between vehicles and operators, and from 18 February 2027 the EU Batteries Regulation requires a digital battery passport for each one.
The rules pushing fleets are already in place, though. The EU's CO2 standards for heavy-duty vehicles demand a 45% cut by 2030, with later milestones under review in Brussels, and Germany exempts zero-emission trucks from its motorway toll until mid-2031. For a haulier choosing next year's vehicle, the toll exemption and the electricity price matter more than how fast a pack comes out.
What this means for you
A 1,000 km claim for a 40-tonne truck is the same figure the flagship BYD Denza Z9GT quotes on China's CLTC cycle (1,036 km) — a reminder that range claims depend entirely on the cycle and the load.
If Swaptopus delivers, the everyday effect is quieter pre-dawn deliveries, cleaner air on the streets where children walk, and freight bills no longer tied to the oil price. If it stalls, we get the opposite. The first test is not a press release but a location: watch for the first named Swaptopus stations, which truck brands sign up to a common pack, and whether DHL's trial routes reach central Europe. And if you run a small van fleet, start with your own depot tariff — that is the number that decides whether an electric van or truck ever pays for itself.
