CATL's Sodium-Ion Claims Split in Two: 175 Wh/kg for Cars, 15,000 Cycles for Grid Storage

Two CATL numbers keep getting welded into one product. The first is 175 Wh/kg, the energy density CATL gives its Naxtra sodium-ion cell for cars. The second is more than 15,000 cycles at 80% capacity retention, which a report on CATL's grid-storage order attaches to a storage cell rated at about 160 Wh/kg. A headline that reached Hacker News on November 6 combines them with a claim of cost parity with lithium iron phosphate (LFP) and a 30-year life. The Terminal could not load that page, so it is not cited here. Neither report below carries a price.

What CATL says the car cell does

At a joint unveiling with Changan Automobile in Hulunbuir, Inner Mongolia on February 5, 2026, CATL put Naxtra at up to 175 Wh/kg, which CnEVPost reports the company calls comparable to mainstream LFP. A 45 kWh pack is quoted at up to 400 km of electric range, with 500 to 600 km projected as the supply chain matures. The report does not say which test cycle produced the 400 km.

The cold-weather claims are the strongest part of the pitch, and all of them are CATL's own. Discharge power at -30°C is nearly triple that of an equal-capacity LFP battery, and capacity retention at -40°C is above 90%. Gao Huan, CTO of CATL's China E-car business, called the arrival of sodium-ion the start of a "dual-chemistry era". CATL is Changan's exclusive sodium-ion partner and will supply Avatr, Deepal, Qiyuan and UNI, with a first vehicle targeted for mid-2026. CnEVPost does not name the car shown.

The cell's 175 Wh/kg is a cell-level figure. A 45 kWh pack built from it holds roughly 257 kg of cells before housing, cooling and wiring, which is the arithmetic behind why sodium-ion has so far suited short-range cars.

Where 15,000 cycles comes from

The cycle figure appears in New Mobility's report on April 29, 2026, about a three-year, 60 GWh sodium-ion supply agreement between CATL and Beijing HyperStrong Technology for energy storage. It lists the storage cell at about 160 Wh/kg, more than 15,000 cycles to 80% capacity, and an operating range of -40°C to +70°C. The "about forty years" of daily use is the report's own extrapolation, not a CATL warranty. Fifteen thousand daily cycles is 41 years, so the extrapolation is plain division.

1. Naxtra EV cell175 Wh/kg
2. Energy-storage cell160 Wh/kg

Source: CnEVPost (Feb. 5, 2026) and New Mobility (Apr. 29, 2026), CATL figures, accessed 2026-11-07

A car and a storage container stress a cell differently. Daily full cycles in a grid container at moderate temperature are gentler than fast charging in a cold car park, and CnEVPost's report on the car cell makes no cycle-life claim at all. Reading 15,000 cycles across to Naxtra in a Deepal is an inference nobody at CATL is quoted making.

Claim	Figure	Where it appears
EV cell density	Up to 175 Wh/kg	CnEVPost
Storage cell density	About 160 Wh/kg	New Mobility
Cycle life	15,000+ to 80%	New Mobility (storage cell)
Cold retention	Above 90% at -40°C	CnEVPost
Price	None given	Neither

The 60 GWh order in scale

New Mobility says CATL's energy-storage cell shipments in 2025, across all chemistries, were about double 60 GWh. Spread over three years, the HyperStrong agreement is 20 GWh a year, around a sixth of that base, which makes it large for sodium-ion and modest against CATL's lithium output. CATL's mass-production target for Naxtra is the end of 2026, per New Mobility.

CATL says it began sodium-ion research in 2016 and spent nearly RMB 10 billion ($1.44 billion), developing nearly 300,000 test cells, per CnEVPost. That is the cost of getting here; it is not a unit price.

Battery buyers in other segments face the same cycle-life question, as in Electrovaya's Janus Electric orders, and chemistry choices will matter for packs like the 69 kWh one in Lucid's Cosmos teaser.

What would change my read

A published cell price per kWh, from CATL or a buyer, would settle the cost-parity claim. A cycle test on the Naxtra car cell at a disclosed depth of discharge and charge rate would settle the other. Absent both, 175 Wh/kg and 15,000 cycles are two separate vendor numbers about two separate cells, and the page promising parity has shown neither.