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Founded Year



Angel | Alive

Total Raised


Last Raised

$100K | 2 yrs ago

Mosaic Score
The Mosaic Score is an algorithm that measures the overall financial health and market potential of private companies.

+40 points in the past 30 days

About Rejoule

ReJoule designs and builds a battery management system. The system allows automakers to reduce electronic vehicle (EV) battery costs, warranty costs, and testing time. It was founded in 2017 and is based in Signal Hill, California.

Headquarters Location

2888 Gundry Avenue

Signal Hill, California, 90755,

United States


Rejoule's Product Videos

Rejoule's Products & Differentiators

    Pack Grading Tool (PGT)

    Using an EV’s charge port, ReJoule’s PGT is a portable device that can measure a battery pack’s State of Health while the battery is still in-vehicle.


Expert Collections containing Rejoule

Expert Collections are analyst-curated lists that highlight the companies you need to know in the most important technology spaces.

Rejoule is included in 3 Expert Collections, including Auto Tech.


Auto Tech

3,931 items

Companies working on automotive technology, which includes vehicle connectivity, autonomous driving technology, and electric vehicle technology. This includes EV manufacturers, autonomous driving developers, and companies supporting the rise of the software-defined vehicles.


Energy Storage

1,634 items

Companies in the Energy Storage space, including those developing and manufacturing energy storage solutions such as lithium-ion batteries, solid-state batteries, and related software for battery management.


Energy Management Software

676 items

Companies creating software to help manage, optimize, and automate energy management and optimization.

Rejoule Patents

Rejoule has filed 1 patent.

The 3 most popular patent topics include:

  • electric power conversion
  • electrical engineering
  • electrical test equipment
patents chart

Application Date

Grant Date


Related Topics




Electronic test equipment, Electrical test equipment, Energy storage, Electric power conversion, Electrical engineering


Application Date


Grant Date



Related Topics

Electronic test equipment, Electrical test equipment, Energy storage, Electric power conversion, Electrical engineering



Latest Rejoule News

Recycling and ‘second life’ options keep retired EV batteries out of landfills

Jan 23, 2024

Hurdles remain to scale up EV battery reuse and recycling. But experts are optimistic this valuable green tech waste can stay green. A worker checks parts for the battery packs at a factory of Sunwoda Electric Vehicle Battery in Nanjing, China, which makes lithium batteries for electric cars. (FeatureChina via AP Images) PUBLISHED: | UPDATED: January 23, 2024 at 4:45 a.m. As we transition to a green economy, we’re generating waste that, if we aren’t careful, isn’t so green. We looked at barriers and opportunities around three of the most challenging types of clean energy tech waste. This is one story in that four-part series. The field of solar panels dotting a stretch of desert in Lancaster looks like a typical solar farm. But the project, owned by Santa Monica-based B2U Storage Solutions, is believed to be the nation’s first to pair a solar energy system with retired EV batteries, which store the energy captured by solar panels and sell it back to the state energy grid as needed. Batteries for EVs are the green tech waste stream that gets the most attention. But experts say they might be the least problematic, with many examples of profitable repurposing and recycling operations already established. While EV sales hit a record high in 2023, just 1% of the nearly 300 million vehicles in the United States today are electric. And since battery warranties typically run for eight to 10 years, Slattery said there just haven’t yet been many retired batteries to grapple with. That will change soon, though, with consulting firm McKinsey & Company estimating more than 100 million EV batteries will be retired over the next decade. The first preference, if possible, is to find a second life for retired EV batteries. Used batteries that came out of delivery trucks sit on the floor at ReJoule in Signal Hill, CA on Friday, January 28, 2022. ReJoule is giving electric vehicle batteries a second life by repurposing the used batteries for solar storage.Each electric truck that these batteries came out of hold 56 batteries. (Photo by Paul Bersebach, Orange County Register/SCNG) Many EV warranties kick in when a battery dips below 80% of its range capacity, according to Jessica Dunn, a senior analyst focused on transportation at the Union of Concerned Scientists. That means those batteries have lots of life left for energy storage , such as the Lancaster project. There are talks of using old batteries to charge existing EV batteries, Dunn said, or to supply electricity to grocery stores when the power goes out so they can avoid using gas-powered generators. Reusing batteries in this way “is a relatively new concept that has yet to build a track record of performance” though, according to Jason Burwen, a vice president with Oregon-based GridStor. That’s why Burwen’s company is sticking with new batteries as it looks to develop a stationary storage facility in Santa Fe Springs. To build confidence in second-life options for EV batteries, Meg Slattery, a PhD candidate at UC Davis who’s been studying battery recycling, said there needs to be better data sharing about the life of the equipment and tools to measure their health. Another challenge for battery repurposing is that the price of new products is coming down so rapidly that retired EV batteries are losing their economic edge. It’s why Ryan Melsert, CEO of American Battery Technology Company, believes the future solution primarily lies in recycling. Cobalt, nickel, lithium; all are in EV batteries and all are valuable. Some 99% of those materials are now sourced from other countries, often after environmentally damaging extraction processes. So if Melsert’s company — which has won government grants to open a recycling plant in Reno in 2026 — can recover those minerals from decommissioned EV batteries, the U.S. will be less reliant on foreign markets to make new batteries. Melsert’s team started at Tesla, so he said they were able to deconstruct the familiar battery manufacturing process and figure out how to reclaim 80% of the materials. But because that process is so technical and so new, Melsert said there aren’t many companies doing the work yet, with no EV battery recyclers yet in California. “There’s already more end-of-life batteries that need to be recycled than there is recycling capacity.” There are efforts to establish battery recycling alongside lithium extraction and battery manufacturing operations near the Salton Sea . Slattery said that sort of circular system, powered by the area’s clean geothermal energy, would be an ideal solution from an emissions standpoint. Mud pots sit in front of EnergySource’s geothermal plant near the Salton Sea in Calipatria, CA, on Wednesday, April 19, 2023. (Photo by Jeff Gritchen, Orange County Register/SCNG) There is a push underway to stop building EV batteries with nickel and cobalt, which are some of the most valuable minerals that recyclers recover today. That could pose a challenge for recyclers down the road, which are building out their businesses using economics of today’s battery models. But Melsert noted all EVs on the road today still contain them. So, just like the sector overall has time to prepare for the coming flood of retired EV batteries, he said there’s a solid window for recyclers to scale up, make their operations more efficient and adapt to any such changes coming down the pike.

Rejoule Frequently Asked Questions (FAQ)

  • When was Rejoule founded?

    Rejoule was founded in 2017.

  • Where is Rejoule's headquarters?

    Rejoule's headquarters is located at 2888 Gundry Avenue, Signal Hill.

  • What is Rejoule's latest funding round?

    Rejoule's latest funding round is Angel.

  • How much did Rejoule raise?

    Rejoule raised a total of $4.7M.

  • Who are the investors of Rejoule?

    Investors of Rejoule include San Diego Angel Conference, IgniteX Accelerator, Southern California Energy Innovation Network, Small Business Innovation Research Awards, The California Energy Commission and 6 more.

  • Who are Rejoule's competitors?

    Competitors of Rejoule include Recurrent and 6 more.

  • What products does Rejoule offer?

    Rejoule's products include Pack Grading Tool (PGT) and 1 more.


Compare Rejoule to Competitors

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Battery Log is a company that specializes in battery management in the technology sector. The company offers services that provide real-time status updates on batteries, identifies unused optimization potential, and extends the battery's lifespan. It uses a cloud-based digital twin to collect relevant battery measurements and uses algorithms to calculate the health of each battery based on its usage. It was founded in 2022 and is based in Berne, Switzerland.


AVILOO focuses on the development of independent testing systems for the automotive industry. The company's main service is providing a diagnostic tool for the batteries of electric and plug-in hybrid vehicles, which helps users understand the current status of the battery and make informed purchasing decisions. It was founded in 2017 and is based in Wiener Neudorf, Austria.

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volytica diagnostics

volytica diagnostics is a battery asset management platform. It offers battery degradation diagnosis software and dashboard-based warranty monitoring, lifetime and tco optimization, and more. The company was founded in 2019 and is based in Dresden, Germany.

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Coulomb AI

Coulomb AI is a company that focuses on real-time battery analytics in the technology sector. The company offers a platform that provides comprehensive analytics on battery health and operations, enabling users to monitor, analyze, and optimize their batteries. Coulomb AI primarily serves the automotive industry, battery manufacturers, and battery service providers. It was founded in 2020 and is based in Bengaluru, India.


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