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Adden Energy
Transportation · Waltham, United States · Founded 2021
A developer of stable, lithium-metal, solid-state batteries MoreLess
Adden Energy is a technology company, spun out of Harvard University, that specializes in the development of advanced solid-state batteries for electric vehicles (EVs). The company is focused on creating a commercially viable solid-state battery that addresses key limitations of current lithium-ion technology.
Adden Energy's core product is a dynamically-stable, lithium-metal battery that has demonstrated the ability to charge in as little as three minutes and endure over 10,000 cycles in a laboratory setting. This extended lifespan and rapid charging capability are designed to accelerate the adoption of EVs by making them more convenient and accessible to a wider range of consumers. The company is also working to improve the performance of its batteries in low-temperature conditions.
The company's business model appears to be centered on a business-to-business (B2B) approach, targeting original equipment manufacturers (OEMs) in the automotive sector. Adden Energy has established a pilot production line to produce sample cells for these potential clients. The company has secured significant funding to scale its research and development efforts and to advance the commercialization of its battery technology.
Keywords: solid-state battery, lithium-metal, electric vehicles, fast charging, energy storage, battery technology, automotive, OEM, Harvard University, cleantech
Company overview
Adden Energy company information
The essential company record, classifications and operating signals in one place.
- Status
- Operational
- Founded
- 2021
- Headquarters
- Waltham, United States
- Employees
- 23
- Open positions
- None listed
- Dealroom signal
- 87.7
Valuation & funding
Adden Energy funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| SERIES A✓Equity / VC | Oct 2024 | $15M | $60M | MassVentures · Primavera Capital Group · Rhapsody Venture Partners · At One Ventures | ↗ |
| SEED✓Equity / VC | Sep 2022 | $5.2M | $21M | MassVentures · Rhapsody Venture Partners · Primavera Capital Group | ↗ |
| GRANT✓Other financing | Sep 2022 | $0 | — | Harvard University | ↗ |
| SEEDEquity / VC | Feb 2022 | $5.2M | $21M | Rhapsody Venture Partners | ↗ |
| SPINOUT✓Other financing | Jan 2021 | $0 | — | Harvard University | ↗ |
Financials
Workforce over time
Available workforce history. Financial fields without reported data are omitted.
| Year | Employees |
|---|---|
| 2026 | 23 |
| 2025 | 22 |
| 2024 | 10 |
| 2023 | 8 |
| 2022 | 5 |
Growth signals
Adden Energy website traffic
Latest recorded traffic for Adden Energy is 740 monthly website visits, down 70.4% over the last three months. Adden Energy's team grew 4.5% over the past year.
Comparisons
Adden Energy compared with similar companies
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Talent graph
Adden Energy's talent
Source: Dealroom Talent Intelligence.
Investors
5 investors on Adden Energy's cap table
Sourced from Dealroom's funding and investor records.
Global footprint
Where Adden Energy has talent and traffic
team presence
In the news
Latest news about Adden Energy
Recent press, funding announcements, and product moves mentioning Adden Energy — open to read from the original sources.
Market sentiment
What the market is saying about Adden Energy
An AI-synthesized read of the highest-engagement posts about Adden Energy on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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