Key facts
- XL Batteries’s last known valuation is $44.0M (Feb 2023).
- It has raised $34.7M across 3 recorded rounds; the latest was Early Stage VC ($7.5M) in Aug 2025.
- Notable investors include Plug and Play Tech Center, US National Science Foundation, Third Derivative, SIP Global Partners, Xerox Ventures — 16 tracked in total.
- XL Batteries has filed 4 Form Ds with the SEC since 2022, most recently Aug 2025 ($7.5M sold to 1 investors).
- Status: Privately Held (backing).
- ·Post-money valuations for all 3 rounds
- ·The complete investor list — 16 names
- ·Watchlist + deal alerts for XL Batteries
Funding rounds
3 roundsAbout XL Batteries
Developer of batteries designed to reduce waste within the existing energy infrastructure and unlock the potential of renewables for a sustainable future. The company's novel, non-corrosive chemistry pairs with the powerfully scalable architecture of flow batteries, which produces a system that is stable, safe, non-flammable, inexpensive in every component, and simple to scale, providing firms with electrochemical storage alternatives for their grid that can be used anywhere, anytime.
- Sector
- Business Products and Services (B2B)
- HQ
- Marlborough, MA, United States
- Founded
- 2019
- Employees
- 28
- Website
- xlbatteries.com/
- Ownership
- Privately Held (backing)
XL Batteries doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in XL Batteries shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on XL Batteries in its N-PORT filings yet. We sweep new filings monthly.