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XL Batteries

Marlborough, MA · Founded 2019 · Privately Held (backing)

Developer of batteries designed to reduce waste within the existing energy infrastructure and unlock the potential of renewables for a sustainable future. XL Batteries is based in Marlborough, MA and was founded in 2019. Its last reported valuation was $44 million in Feb 2023. It has raised $34.7 million across 3 recorded rounds; the latest was a $7.5 million early-stage round in Aug 2025.

Last reported valuation
$44.0M
Oct 2026
Priced at
—
Total raised
$34.7M
Last round
Early Stage VC
Aug 2025

XL Batteries key facts

as of Oct 2026
  • Developer of batteries designed to reduce waste within the existing energy infrastructure and unlock the potential of renewables for a sustainable future.
  • XL Batteries is valued at approximately $44.0M as of Oct 2026 (last reported valuation).
  • 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).
Last reported valuation
LOW confidence
$44.0M

XL Batteries's last reported valuation, Feb 2023. Nothing priced has surfaced since.

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XL Batteries funding rounds

3 rounds
Aug 2025Early Stage VC$7.5MSEC filing▮
Apr 2024Early Stage VC$7.7MSEC filing▮
Aug 2022Early Stage VC$8.0MSEC filing▮
Full funding history →

XL Batteries valuation

XL Batteries's last reported valuation was $44 million in Feb 2023. No priced round, secondary trade or fund mark has surfaced since.

How much has XL Batteries raised?

XL Batteries has raised $34.7 million across 3 recorded rounds since 2022. The largest was an $8 million early-stage round in Aug 2022; the most recent was a $7.5 million early-stage round in Aug 2025.

XL Batteries has filed 4 Form Ds with the SEC since 2022, most recently in Aug 2025 ($7.5 million sold to 1 investor).

XL Batteries investors

16 investors are on record for XL Batteries, including Plug and Play Tech Center, US National Science Foundation, Third Derivative and SIP Global Partners. The early-stage round in Aug 2025 drew 1 investor.

About 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
Ownership
Privately Held (backing)

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