Gouach wants you to insert and pluck the cells from its Infinite e-bike battery
Harvest, pack, ride
Gouach wants you to insert and pluck the cells from its Infinite e-bike battery
Tiny French firm wants to keep a few bad cells from spoiling a lot of e-bikes.
Kevin Purdy
–
May 22, 2025 4:12 pm
|
11
Credit:
Gouach
Credit:
Gouach
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E-bike batteries are, for the most part, a collection of 18650 batteries, packaged together and welded in series and parallel, attached to a battery management system. A "dead" e-bike battery may only have two or three truly dead cells inside, while the remainder work fine. This is useful knowledge that, for the most part, very few e-bike owners can really use. Arc welders are not a common tool to own, and most e-bike batteries are not designed to be opened, safely or otherwise.
French firm Gouach, essentially a three-person company, is pitching its Infinite Battery as the opposite of this status quo. It's a durable, fireproof casing into which you can place and replace 18650 batteries using only a screwdriver. It keeps you updated on the status of cell performance and heat through a Bluetooth-connected app. And it's designed for compatibility with "90% of existing e-bike brands," or you can upgrade an existing "acoustic" model.
Circuit boards, bent to riders’ will
Alexandre Vallette, CEO of Gouach, told Ars that developing a system for no-weld battery wiring involved "a lot of trial and error" over four years. A typical "spring" contact for an 18650—the kind used by most devices that take AA or AAA batteries—doesn't work, because bike rides can knock them loose with vibration. What emerged were custom-printed circuit boards, with just-flexible-enough contacts cut into the board to carry the current from each battery to the BMS, allowing for thermal monitoring across numerous points on the package.
The Infinite Battery's case, too, was born of hard-won experimentation. Gouach provided early versions of its refillable batteries early on for a European bike-share company, using an off-the-shelf "shark"-style casing. Like anyone who lives in a city with dockless bike-sharing, they discovered the variety of places and angles at which people will leave a shared bike. Water ingress killed a number of bike batteries.
"It was really a setback for the companyat the time," Vallette said. "But we knew that the technology itself was good, so we designed our own casing." Gouach's casing is now rated IP67, Vallette said, and meets UL 2271 standards.
Gouach's video demonstrating its battery case's fire resistance.
Unexpected resistance
There are three avenues for selling the Infinite Battery, as Vallette sees it. One is working with e-bike makers to incorporate Gouach's tech. Another is targeting e-bike owners and small bike shops who, this far into e-bikes' history, might be dealing with dead batteries. And then there are folks looking to build their own e-bikes.
The Infinite Battery will be made available in 36 V and 48 V builds, and Gouach's app promises to help owners connect it to a wide variety of bikes. Actually fitting the battery case onto your bike is a different matter. Some bikes can accommodate the Gouach kit where their current battery sits, while others may end up mounting to a rack, or through creative, but hopefully secure, frame attachments.
One of the biggest compatibility challenges, Vallette said, was finding a way to work with Bosch's mid-drive motors. The communications between a Bosch motor and battery are encrypted; after "a serious effort," Gouach's app and battery should work with them, Vallette said.
Gouach, having raised more than on crowdfunding platform Indiegogo from about 500 backers, and million in venture funding, is getting close to offering the batteries through its own storefront. Gouach's roadmap puts them in mass production at the moment, with assorted bugs, certifications, and other matters to clear. EU-based backers should get their kits in June, with the US, and an open online store, to follow, barring whatever happens next in international trade. Vallette said in mid-May that the US's momentary 145 percent tariffs on Chinese imports disrupted their plans, but work was underway.
If nothing else, Gouach's DIY kit shows that a different way of thinking about e-bike batteries—as assemblages, not huge all-in-one consumables—is possible.
Kevin Purdy
Senior Technology Reporter
Kevin Purdy
Senior Technology Reporter
Kevin is a senior technology reporter at Ars Technica, covering open-source software, PC gaming, home automation, repairability, e-bikes, and tech history. He has previously worked at Lifehacker, Wirecutter, iFixit, and Carbon Switch.
11 Comments
#gouach #wants #you #insert #pluck
Gouach wants you to insert and pluck the cells from its Infinite e-bike battery
Harvest, pack, ride
Gouach wants you to insert and pluck the cells from its Infinite e-bike battery
Tiny French firm wants to keep a few bad cells from spoiling a lot of e-bikes.
Kevin Purdy
–
May 22, 2025 4:12 pm
|
11
Credit:
Gouach
Credit:
Gouach
Story text
Size
Small
Standard
Large
Width
*
Standard
Wide
Links
Standard
Orange
* Subscribers only
Learn more
E-bike batteries are, for the most part, a collection of 18650 batteries, packaged together and welded in series and parallel, attached to a battery management system. A "dead" e-bike battery may only have two or three truly dead cells inside, while the remainder work fine. This is useful knowledge that, for the most part, very few e-bike owners can really use. Arc welders are not a common tool to own, and most e-bike batteries are not designed to be opened, safely or otherwise.
French firm Gouach, essentially a three-person company, is pitching its Infinite Battery as the opposite of this status quo. It's a durable, fireproof casing into which you can place and replace 18650 batteries using only a screwdriver. It keeps you updated on the status of cell performance and heat through a Bluetooth-connected app. And it's designed for compatibility with "90% of existing e-bike brands," or you can upgrade an existing "acoustic" model.
Circuit boards, bent to riders’ will
Alexandre Vallette, CEO of Gouach, told Ars that developing a system for no-weld battery wiring involved "a lot of trial and error" over four years. A typical "spring" contact for an 18650—the kind used by most devices that take AA or AAA batteries—doesn't work, because bike rides can knock them loose with vibration. What emerged were custom-printed circuit boards, with just-flexible-enough contacts cut into the board to carry the current from each battery to the BMS, allowing for thermal monitoring across numerous points on the package.
The Infinite Battery's case, too, was born of hard-won experimentation. Gouach provided early versions of its refillable batteries early on for a European bike-share company, using an off-the-shelf "shark"-style casing. Like anyone who lives in a city with dockless bike-sharing, they discovered the variety of places and angles at which people will leave a shared bike. Water ingress killed a number of bike batteries.
"It was really a setback for the companyat the time," Vallette said. "But we knew that the technology itself was good, so we designed our own casing." Gouach's casing is now rated IP67, Vallette said, and meets UL 2271 standards.
Gouach's video demonstrating its battery case's fire resistance.
Unexpected resistance
There are three avenues for selling the Infinite Battery, as Vallette sees it. One is working with e-bike makers to incorporate Gouach's tech. Another is targeting e-bike owners and small bike shops who, this far into e-bikes' history, might be dealing with dead batteries. And then there are folks looking to build their own e-bikes.
The Infinite Battery will be made available in 36 V and 48 V builds, and Gouach's app promises to help owners connect it to a wide variety of bikes. Actually fitting the battery case onto your bike is a different matter. Some bikes can accommodate the Gouach kit where their current battery sits, while others may end up mounting to a rack, or through creative, but hopefully secure, frame attachments.
One of the biggest compatibility challenges, Vallette said, was finding a way to work with Bosch's mid-drive motors. The communications between a Bosch motor and battery are encrypted; after "a serious effort," Gouach's app and battery should work with them, Vallette said.
Gouach, having raised more than on crowdfunding platform Indiegogo from about 500 backers, and million in venture funding, is getting close to offering the batteries through its own storefront. Gouach's roadmap puts them in mass production at the moment, with assorted bugs, certifications, and other matters to clear. EU-based backers should get their kits in June, with the US, and an open online store, to follow, barring whatever happens next in international trade. Vallette said in mid-May that the US's momentary 145 percent tariffs on Chinese imports disrupted their plans, but work was underway.
If nothing else, Gouach's DIY kit shows that a different way of thinking about e-bike batteries—as assemblages, not huge all-in-one consumables—is possible.
Kevin Purdy
Senior Technology Reporter
Kevin Purdy
Senior Technology Reporter
Kevin is a senior technology reporter at Ars Technica, covering open-source software, PC gaming, home automation, repairability, e-bikes, and tech history. He has previously worked at Lifehacker, Wirecutter, iFixit, and Carbon Switch.
11 Comments
#gouach #wants #you #insert #pluck
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