Volkswagen ID.Polo and ID.Cross Batteries: Who Makes the Cells and What’s Inside

The ID.Polo and ID.Cross share the same two batteries: a 37 kWh LFP pack and a 52 kWh NMC pack, both built from Volkswagen’s new Unified Cell, a standard cell of one shape and size that the Group fills with different chemistries and plans to use across most of its brands. Volkswagen makes some of these cells itself in Germany and buys the rest, and China’s Gotion is the only outside supplier confirmed so far.

Most launch coverage stopped at the chemistry. I wanted to know where the cells and the finished packs come from, because that’s the part Volkswagen talks about least. In this piece I’ve kept what Volkswagen has confirmed apart from what trade publications have reported, and I’ve marked the gaps that are still open.

What Batteries Do the ID.Polo and ID.Cross Use?

Both cars are built on MEB+, the updated version of the electric platform under the ID.3 and ID.4, and both get the same two battery options. LFP (lithium iron phosphate) uses no nickel or cobalt and tolerates regular charging to 100%. NMC (nickel manganese cobalt) stores more energy in the same space.

The weight row surprised me. The 52 kWh ID.Polo Life weighs just 1 kg more than the 37 kWh version, even with the stronger motor. NMC cells hold more energy per kilo, so VW could add 15 kWh without a noticeable weight penalty. Consumption barely moves either, with the best figure at 13.3 kWh/100 km for both batteries. For a sense of what this hardware can do, Volkswagen’s Mission Efficiency prototype set three records using ordinary ID.Polo parts.

Both batteries use the same cell, the Unified Cell, which Volkswagen developed with its battery company PowerCo. The name describes the cell’s shape and size, not its chemistry. It’s a prismatic cell, meaning a flat rectangular cell in a hard case, and Volkswagen fills the same case with LFP for the 37 kWh battery and with NMC for the 52 kWh battery. Volkswagen plans to use this one format in up to 80% of the Group’s electric cars across its brands, so it can buy and build cells in far larger volumes and bring the cost down. PowerCo has only published an energy density for the NMC version, about 660 Wh per litre, roughly 10% more than VW’s previous cells.

Volkswagen’s spec sheets only list usable capacity. The gross figures come from Volkswagen’s article on the Martorell plant and from Škoda and Cupra, and Volkswagen lists the nominal voltage of each pack. Put together, they show what sits inside each battery.

The gap between gross and usable capacity is a buffer. Carmakers keep part of the battery out of reach at the top and bottom of the charge range, because cells wear faster when they’re regularly pushed to completely full or completely empty. The buffer also leaves a little energy in reserve when the display shows 0%. The NMC pack gets the bigger buffer, which fits with NMC being more sensitive to sitting at a high charge and with VW’s stricter charging advice for it.

Both per-cell voltages are the usual values for their chemistry, so all the cells in each pack are connected in one long series. Volkswagen doesn’t publish a battery weight or a Wh/kg figure for either pack, and Gotion’s own announcement of its Unified Cell gave no technical figures at all.

Both packs use cell-to-pack construction, which means the cells go straight into the battery without being grouped into modules first. Volkswagen’s older MEB cars, such as the ID.4 and ID.Buzz, still group their pouch cells into shoebox-sized modules. The cells in the new cars sit in three stacks, and VW says the battery housing forms part of the car’s body structure on both models. In the ID.Polo, the stacks are laser-welded and placed in an aluminium case cast in one piece from a single mould, a process Volkswagen describes as new for the Group.

That housing is cast at Volkswagen’s component plant in Kassel, Germany, where the single casting replaces a housing made of 122 separate parts, mostly extruded aluminium profiles. Kassel’s plant manager told the foundry magazine Euroguss in November 2025 that the casting measures about 1.7 m by 1.15 m and goes into the ID.Polo, Cupra Raval and Škoda Epiq. He said it weighs about 10% less and costs around 15% less than the old design. Savings like that add up, because Volkswagen Group’s head of research and development, Michael Steiner, said in March 2025 that the battery still makes up more than a third of an electric car’s cost. That’s a big share for a car Volkswagen promised would start below €25,000.

Who Makes the Cells?

PowerCo started series production of Unified Cells at its gigafactory in Salzgitter, Germany, on 17 December 2025. Those first cells use NMC chemistry, and PowerCo says LFP versions will follow. The plant starts at up to 20 GWh a year with room for 40 GWh. PowerCo expects to cover about half of the Group’s Unified Cell demand, and outside suppliers will make the rest.

Gotion High-Tech is the outside supplier I can confirm. It’s a Chinese battery maker in which Volkswagen has held roughly a quarter of the shares, although VW agreed in September 2026 to sell 5.3% of the company. Gotion began mass production of Unified Cells at its plant in Hefei, China, on 20 November 2025, and VW’s technical chief Thomas Schmall and PowerCo boss Frank Blome received the first cells.

Gotion says it will supply LFP and other chemistries from 2026 to 2032. In a May 2026 investor relations record, it said the deliveries go to Volkswagen Germany, Volkswagen China and PowerCo, covering ID. and Škoda models among others. Volkswagen itself only calls Gotion a cell supplier to the Group, without naming a plant or a model.

It gets vague when you ask which cells end up in which car, and nothing in the table below comes from Volkswagen itself. Trade magazine Automotive Logistics reported in January 2026 that Salzgitter cells travel by truck to the battery plant in Martorell, which builds packs only for the ID.Polo and Raval. Salzgitter makes only NMC cells so far, so those would be the 52 kWh cars. German e-mobility news site electrive wrote in September 2026 that Gotion’s Hefei plant supplies the cells for the Spanish-built ID.Polo and Cupra Raval until PowerCo’s factory in Sagunt, near Valencia, is running, but it named neither a source nor a chemistry.

My own reading is that Gotion supplies the LFP cells in the 37 kWh cars for now, because VW hasn’t announced LFP output in Salzgitter. For the ID.Cross and Škoda Epiq, nobody has reported a cell supplier at all.

There may be a third cell maker soon. The Elec, a Korean electronics trade publication, reported in June 2026 that Samsung SDI will build Unified Cells at its plant in Göd, Hungary, from 2027. Neither company has confirmed it.

I couldn’t find the exact NMC recipe either. The cathode is the positive electrode, and its mix of nickel, manganese and cobalt largely decides how much energy a cell holds. Volkswagen hasn’t published that ratio, and I haven’t found a reliable source that has. You’ll see “NMC 811” mentioned online, but I haven’t seen it backed by anything from VW or PowerCo. What Volkswagen has said is where the cathode material comes from. In 2023, VW and Umicore, a Belgian materials company, said that Salzgitter’s cathode material would come from Umicore’s existing plant in Nysa, Poland.

Oddly, Volkswagen will tell you the kerb weight of every version to the kilogram, but not which country the cells in your car came from. I think that’s a mistake. VW put “Made in Europe” in the title of its 2025 battery announcement, and anyone comparing the ID.Polo with the Chinese-built cars in its rival list has a fair reason to ask. In fairness, Chinese cells would hardly be unusual, since Chinese battery makers now supply almost three quarters of the world’s EVs. Carmakers also rarely publish cell sourcing per model, and suppliers can change during a production run, so a fixed answer is hard to give.

Where Are the Battery Packs Assembled?

The ID.Polo’s packs are built about as close to the car as possible. SEAT and Cupra opened a battery assembly plant at their Martorell factory near Barcelona in December 2025, and it supplies the ID.Polo and Cupra Raval. Volkswagen says it turns out one battery every 45 seconds, or 1,200 a day, and each battery has 468 components. Finished batteries travel to the car assembly line over a 600-metre bridge.

Volkswagen took a different route with the ID.Cross. It started building the car at its Landaben plant in Pamplona on 18 September 2026, alongside the Škoda Epiq, according to industry data service MarkLines. The car’s battery packs come from Hyundai Mobis, the parts company of Hyundai Motor Group, which has been building up its production in Europe and runs a battery assembly plant in Noáin, about 14 km from the VW factory. When construction started in April 2024, Mobis gave the plant a capacity of up to 360,000 battery systems a year and put the investment at about €120 million.

Automotive Logistics describes the arrangement as part of VW’s make-and-buy strategy, with Mobis building identical packs to Volkswagen’s drawings. Local newspaper Noticias de Navarra reported that the supply contract runs from June 2026 to mid-2034. Neither VW nor Mobis has said where the cells for these packs come from.

Which Other Cars Use the Same Batteries?

Four cars share these two batteries. Volkswagen calls them the Electric Urban Car Family, and Škoda’s May 2026 press kit lists all four on the MEB+ platform: the ID.Polo, the ID.Cross, the Cupra Raval and the Škoda Epiq. The ID.Polo and Raval are built in Martorell with packs from the same in-house plant. The ID.Cross and Epiq come from Pamplona with packs from Hyundai Mobis.

On paper the batteries match across all four cars, so the range gaps come mostly from the bodies. With the NMC battery, the ID.Cross gets about 25 km less than the ID.Polo, which fits a taller SUV body pushing more air at speed. The gross figures differ slightly too: Cupra and Škoda list the NMC pack at 55 kWh, while Volkswagen’s Martorell article says 56 kWh. All four agree on 52 kWh usable, which is the number that counts.

If you like the battery but not the styling or the badge, the choice is wider than it looks. I’d compare the Raval and Epiq in your market before signing for a Volkswagen, because the battery hardware is the same either way. I covered the Raval’s UK launch earlier this year.

LFP or NMC: Which One Would I Choose?

I made the case for the base battery in my earlier piece on the ID.Polo’s LFP trim, and the final data hasn’t changed my mind. Early 2026 forecasts had promised up to 130 kW of DC charging for the bigger battery, and Volkswagen’s final figure is 105 kW. Both batteries take about 23 to 24 minutes from 10 to 80%. I haven’t found an independent measurement from ADAC, the German motoring club, or a comparable tester yet, so these are still Volkswagen’s own numbers.

How you charge matters more than the headline capacity. Because VW wants the NMC pack kept at 80% for daily driving, the everyday gap between the two batteries shrinks from 15 kWh to under 5 kWh, or about 30 km of WLTP range.

The LFP pack’s weaker side is winter, because the chemistry slows down more in the cold, as I explained in the LFP vs NMC explainer. A heat pump is optional on the ID.Polo, and I’d tick that box on the LFP car if you live somewhere with real winters. I’d go for the 37 kWh battery if you can charge at home and your normal day stays under about 250 km. I’d pay for the 52 kWh battery if you regularly drive more than 300 km in one go, mostly because you’ll stop less often and it comes with the 155 kW motor anyway. The same logic applies to the ID.Cross, and my ID.Cross launch article has the trim details.

Warranty, V2L and the EU Battery Passport

Volkswagen covers the high-voltage battery for eight years or 160,000 km (99,000 miles) and guarantees at least 70% of its capacity in that time. These are the same terms VW gives its other ID. models. That 70% floor is useful, because a large battery health study found that two identical cars can age very differently.

Both cars can power external devices. The ID.Polo comes with vehicle-to-load (V2L) as standard, delivering up to 3.6 kW through the charging socket, and VW lists the same 3.6 kW for the ID.Cross. You’ll need Volkswagen’s PowerSocket adapter, sold as an optional accessory with a household plug or a camping socket.

From 18 February 2027, EV batteries placed on the EU market need a digital battery passport, according to the European Commission. It’s linked to the battery through a QR code and holds technical, performance, durability, repair and recycling information. In theory, it should also make some of the sourcing questions above easier to answer for cars built after February 2027.

For owners, the more useful part is the battery’s condition, because the battery is the most expensive part of an EV and its health is one of the biggest questions when you buy one used. The same EU law requires the battery management system to record the battery’s state of health and expected lifetime, and gives the owner read-only access to that data so the battery’s remaining value can be judged. When you sell a three-year-old ID.Polo, you should be able to show the buyer how much of the original capacity is left, instead of leaving them to guess from the mileage and the range on the dashboard.

My Verdict

The battery hardware in the ID.Polo and ID.Cross looks well thought out on paper: the NMC pack adds 15 kWh for 1 kg, and both versions charge from 10 to 80% in about 24 minutes. What Volkswagen still doesn’t give buyers is a straight answer on where the cells come from. If you’re weighing the ID.Cross against a Chinese rival, my comparison with the Leapmotor B03X covers the rest of the picture.

I’d choose the 37 kWh LFP version for most people. It’s the battery that keeps the ID.Polo’s starting price below €25,000. Volkswagen is also happy for it to be charged to 100%, so you can use the whole battery every day without setting charge limits or worrying about wear. Charge it at home and let it reach 100% overnight about once a fortnight, as VW recommends, so the car keeps its range display accurate.

It suits short daily commutes with a charger at home or at work, with a fast-charging stop on the odd longer trip, and it makes a good second car for a family. The thing I’ll be watching is the LFP joint venture between PowerCo and Gotion in Valencia, because once it runs, the cheapest ID.Polo could finally get cells made in Spain.

FAQ

Who makes the battery cells for the VW ID.Polo?

Volkswagen hasn’t named the cell supplier for the ID.Polo. Its battery company PowerCo makes NMC Unified Cells in Salzgitter, Germany, and Gotion has made Unified Cells for VW in Hefei, China, since November 2025. German e-mobility site electrive reported in September 2026 that Gotion’s Hefei plant supplies the cells for the Spanish-built ID.Polo, but didn’t name a source.

What is Volkswagen’s Unified Cell?

It’s Volkswagen’s standard prismatic battery cell, developed with its battery company PowerCo, in one shape and size that can hold LFP or NMC chemistry. Volkswagen plans to use it in up to 80% of the Group’s electric cars, and it debuts in the ID.Polo, ID.Cross, Cupra Raval and Škoda Epiq.

Is the ID.Polo battery LFP or NMC?

It depends on the version. The 85 kW and 99 kW models use a 37 kWh LFP battery, while the 155 kW model and the ID.Polo GTI use a 52 kWh NMC battery, according to Volkswagen’s September 2026 data.

Where is the ID.Cross battery made?

Hyundai Mobis assembles the ID.Cross battery packs at its plant in Noáin, about 14 km from Volkswagen’s Pamplona factory. Volkswagen and Mobis haven’t said where the cells inside those packs come from.

How fast does the ID.Polo charge?

Volkswagen quotes about 23 to 24 minutes from 10 to 80% for both batteries. The 37 kWh LFP version peaks at 88 kW and the 52 kWh NMC version at 105 kW, with 11 kW AC charging on both (Volkswagen Germany technical data, November 2026).

Can I charge the ID.Polo LFP battery to 100%?

Yes, Volkswagen says LFP batteries can be charged to 100% regularly. It recommends a full charge about every two weeks, ideally overnight, so the car can recalibrate its charge display.

Which cars use the same battery as the VW ID.Polo?

Four cars share the same 37 kWh LFP and 52 kWh NMC batteries: the VW ID.Polo, VW ID.Cross, Cupra Raval and Škoda Epiq. All four are built in Spain on Volkswagen’s MEB+ platform, according to Škoda’s May 2026 press kit.

What is the battery warranty on the ID.Polo and ID.Cross?

Volkswagen gives eight years or 160,000 km (99,000 miles) on the high-voltage battery, with at least 70% of capacity guaranteed in that period.

Featured Image Source: Volkswagen