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
How much has XL Batteries raised?
$34.7Macross 3 recorded rounds · Aug 2022 – Aug 2025

Most recently, XL Batteries raised $7.5M in its Early Stage VC (Aug 2025).

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XL Batteries round by round

3 rounds
Aug 2025Early Stage VC$7.5MSEC filing▮
1 investors participated
Apr 2024Early Stage VC$7.7MSEC filing▮
27 investors participated
Aug 2022Early Stage VC$8.0MSEC filing▮
13 investors participated

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.

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16 investors have backed XL Batteries.

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Frequently asked about XL Batteries

How much has XL Batteries raised?
XL Batteries has raised $34.7M in total across 3 recorded funding rounds.
When was XL Batteries's last funding round?
XL Batteries's most recent recorded round was Early Stage VC in Aug 2025, raising $7.5M.