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German firm gives ‘second life’ to used EV batteries

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German firm gives ‘second life’ to used EV batteries


‘We want to ensure European sovereignty in energy supply,’ says Voltfang chief David Oudsandji.

A German company is putting used electric vehicle batteries to new use by stacking them into fridge-size units that homes and businesses can use to store their excess solar and wind energy.

This week, the company Voltfang—which means “catching volts”—opened its first industrial site in Aachen, near the Belgian and Dutch borders.

With around 100 staff, Voltfang says it is the biggest facility of its kind in Europe in the budding sector of refurbishing .

Its CEO David Oudsandji hopes it will help Europe’s biggest economy wean itself off and increasingly rely on climate-friendly renewables.

While now dot Germany’s countryside and are found on many rooftops, he says the country still needs to build up battery storage capacity.

“We want to ensure European sovereignty in by enabling renewable energy production through storage,” Oudsandji, 29, told AFP.

“We can generate enormous amounts of electricity from solar and , then store it in a decentralized way all across Germany and distribute it,” he said.

“This means that the more renewable energy we use, the more we deploy, the less we need fossil gas or oil.”

A wind turbine and a lignite-fired power plant near Neurath, western Germany
A wind turbine and a lignite-fired power plant near Neurath, western Germany.

Inside the site, technicians receive used EV batteries and test them to determine their remaining lifespans.

Those still found to be in good condition are reconditioned for their “” and fitted inside cabinets the size of large refrigerators—effectively huge power banks for excess electricity.

Among the first customers is the discount supermarket chain Aldi Nord, which wants to store power from its rooftop for later use.

Clean energy push

Voltfang, founded in 2020 by three university engineering students, aims to produce enough systems by 2030 to store a capacity of one gigawatt-hour (GWh) of electricity per year, enough for 300 homes.

It is one of many small steps meant to help Germany’s decades-old “Energiewende”, or energy transition.

Last year, renewables covered nearly 60% of electricity produced in Germany, and the target is 80% by 2030.

Voltfang is developing and manufacturing battery storage systems from reusable and surplus electric car batteries
Voltfang is developing and manufacturing battery storage systems from reusable and surplus electric car batteries.

One problem for solar and wind is what to do on days when the sun doesn’t shine and the wind doesn’t blow.

Such “dark lulls”, most common in winter, have at times forced Germany to temporarily import power produced by French nuclear reactors or Polish coal plants.

To guarantee a secure supply, conservative Chancellor Friedrich Merz’s government plans to build around 20 new gas-fired power plants by 2030.

The Greens and environmental groups have denounced this as a step backward in German climate policy and fear the country will not meet its goal of carbon neutrality by 2045.

Circular economy

Europe’s battery sector is still nascent but expected to grow fast.

“In our opinion, small-scale distributed energy assets such as battery storage will play a major role to create efficient energy systems,” said Marc Sauthoff of the business consultancy Roland Berger.

The storage systems can power solar panels and heat pumps, or be used to feed electricity into the grid when needed
The storage systems can power solar panels and heat pumps, or be used to feed electricity into the grid when needed.

The stationary storage market is growing exponentially in Germany: about six GWh of capacity were installed at end-2024, up from 2.5 GWh in 2022, he said.

Voltfang hopes to be profitable by next year, Oudsandji said, though he conceded there are hurdles.

For one thing, the supply of used EV batteries is still small, given that most vehicles have been on the road for only a few years.

Also, new batteries, produced mainly in China, are becoming more efficient and less expensive, making it harder to compete against them with refurbished models.

Oudsandji acknowledged that testing and refurbishing old batteries “is more complex” than simply buying new ones.

“But the big advantage is that it is more sustainable,” he said. “It is cheaper and allows us to create a circular economy, thus ensuring Europe’s independence in resource supply.”

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Asus Made a Split Keyboard for Gamers—and Spared No Expense

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Asus Made a Split Keyboard for Gamers—and Spared No Expense


The wheel on the left side has options to adjust actuation distance, rapid-trigger sensitivity, and RGB brightness. You can also adjust volume and media playback, and turn it into a scroll wheel. The LED matrix below it is designed to display adjustments to actuation distance but feels a bit awkward: Each 0.1 mm of adjustment fills its own bar, and it only uses the bottom nine bars, so the screen will roll over four times when adjusting (the top three bars, with dots next to them, illuminate to show how many times the screen has rolled over during the adjustment). The saving grace of this is that, when adjusting the actuation distance, you can press down any switch to see a visualization of how far you’re pressing it, then tweak the actuation distance to match.

Alongside all of this, the Falcata (and, by extension, the Falchion) now has an aftermarket switch option: TTC Gold magnetic switches. While this is still only two switches, it’s an improvement over the singular switch option of most Hall effect keyboards.

Split Apart

Photograph: Henri Robbins

The internal assembly of this keyboard is straightforward yet interesting. Instead of a standard tray mount, where the PCB and plate bolt directly into the bottom half of the shell, the Falcata is more comparable to a bottom-mount. The PCB screws into the plate from underneath, and the plate is screwed onto the bottom half of the case along the edges. While the difference between the two mounting methods is minimal, it does improve typing experience by eliminating the “dead zones” caused by a post in the middle of the keyboard, along with slightly isolating typing from the case (which creates fewer vibrations when typing).

The top and bottom halves can easily be split apart by removing the screws on the plate (no breakable plastic clips here!), but on the left half, four cables connect the top and bottom halves of the keyboard, all of which need to be disconnected before fully separating the two sections. Once this is done, the internal silicone sound-dampening can easily be removed. The foam dampening, however, was adhered strongly enough that removing it left chunks of foam stuck to the PCB, making it impossible to readhere without using new adhesive. This wasn’t a huge issue, since the foam could simply be placed into the keyboard, but it is still frustrating to see when most manufacturers have figured this out.



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These Sub-$300 Hearing Aids From Lizn Have a Painful Fit

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These Sub-0 Hearing Aids From Lizn Have a Painful Fit


Don’t call them hearing aids. They’re hearpieces, intended as a blurring of the lines between hearing aid and earbuds—or “earpieces” in the parlance of Lizn, a Danish operation.

The company was founded in 2015, and it haltingly developed its launch product through the 2010s, only to scrap it in 2020 when, according to Lizn’s history page, the hearing aid/earbud combo idea didn’t work out. But the company is seemingly nothing if not persistent, and four years later, a new Lizn was born. The revamped Hearpieces finally made it to US shores in the last couple of weeks.

Half Domes

Photograph: Chris Null

Lizn Hearpieces are the company’s only product, and their inspiration from the pro audio world is instantly palpable. Out of the box, these look nothing like any other hearing aids on the market, with a bulbous design that, while self-contained within the ear, is far from unobtrusive—particularly if you opt for the graphite or ruby red color scheme. (I received the relatively innocuous sand-hued devices.)

At 4.58 grams per bud, they’re as heavy as they look; within the in-the-ear space, few other models are more weighty, including the Kingwell Melodia and Apple AirPods Pro 3. The units come with four sets of ear tips in different sizes; the default mediums worked well for me.

The bigger issue isn’t how the tip of the device fits into your ear, though; it’s how the rest of the unit does. Lizn Hearpieces need to be delicately twisted into the ear canal so that one edge of the unit fits snugly behind the tragus, filling the concha. My ears may be tighter than others, but I found this no easy feat, as the device is so large that I really had to work at it to wedge it into place. As you might have guessed, over time, this became rather painful, especially because the unit has no hardware controls. All functions are performed by various combinations of taps on the outside of either of the Hearpieces, and the more I smacked the side of my head, the more uncomfortable things got.



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Two Thinking Machines Lab Cofounders Are Leaving to Rejoin OpenAI

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Two Thinking Machines Lab Cofounders Are Leaving to Rejoin OpenAI


Thinking Machines cofounders Barret Zoph and Luke Metz are leaving the fledgling AI lab and rejoining OpenAI, the ChatGPT-maker announced on Thursday. OpenAI’s CEO of applications, Fidji Simo, shared the news in a memo to staff Thursday afternoon.

The news was first reported on X by technology reporter Kylie Robison, who wrote that Zoph was fired for “unethical conduct.”

A source close to Thinking Machines said that Zoph had shared confidential company information with competitors. WIRED was unable to verify this information with Zoph, who did not immediately respond to WIRED’s request for comment.

Zoph told Thinking Machines CEO Mira Murati on Monday he was considering leaving, then was fired today, according to the memo from Simo. She goes on to write that OpenAI doesn’t share the same concerns about Zoph as Murati.

The personnel shake-up is a major win for OpenAI, which recently lost its VP of research, Jerry Tworek.

Another Thinking Machines Lab staffer, Sam Schoenholz, is also rejoining OpenAI, the source said.

Zoph and Metz left OpenAI in late 2024 to start Thinking Machines with Murati, who had been the ChatGPT-maker’s chief technology officer.

This is a developing story. Please check back for updates.



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