Energy Storage

Energy drives all processes.

Producing and using energy efficiently
and cleanly is essential to our future.

Our technology will reduce waste within the existing energy infrastructure, and unlock the potential of renewables for a sustainable future.

Less than 1% of the daily energy used in the US can be stored on the grid.

95% of this storage is pumped hydroelectricity, a legacy technology where excess energy is used to pump water uphill to a reservoir, for later release through a hydroelectric generator.

This is very geographically limiting.

U.S. DOE (2017) Global Energy Storage Database Projects.

We aim to bring widespread
electrochemical storage to the grid
for use anywhere, anytime.


February 2023

XL Batteries closes a $10M Series Seed II round led by Catalus Capital with participation from additional investors, including Xerox Ventures, SIP Global and founding investors Jeffrey Schwarz, Joel Greenblatt, and Robert Goldstein. 

Read the full press release here.

January 2023

XL Batteries and Stolthaven Terminals announce a partnership to develop an industrial-scale flow battery.

“While there has been significant focus on renewable power generation there has been less focus on long-term energy storage, which is critical for the global transition to ‘greener’ energy alternatives. Stolthaven Terminals has been working on finding a partner in electrochemical storage and in XL Batteries we have found one that shares our vision to use innovation and skills partnerships to develop energy solutions for the future.”

– Guy Bessant, President, Stolthaven Terminals

Read the full press release here.

June 2022

XL Batteries welcomes Bart Riley as Chief Commercialization Officer. Bart is leading the transition of XL Batteries’ novel technology from prototype to market. Bart was the co-founder and CTO of A123 systems, a major lithium ion battery manufacturer, where he led the transition from idea to prototype and through IPO to full scale commercialization. After 11 years at A123, Bart was the Chief Strategy Officer at QuantumScape from 2012 to 2016, developing the strategy to bring solid state lithium ion batteries to viability. After QuantumScape, Bart founded metalenz, a chip-scale lens manufacturing company, and Conamix, a sulfur cathode technology company. Bart now brings his extensive energy market experience to XL Batteries.

April 2022

XL Batteries welcomes David A. Christian, retired Executive Vice President and Chief Innovation Officer of Dominion Energy, as an Advisor.

April 2022

XL Batteries relocated to our new headquarters in the Boston area.

October 2021

XL Batteries successfully completed work on our NSF SBIR Phase I award project, delivering a long list of compatible options for battery fabrication and a working prototype made from inexpensive and easy-to-process plastics.

September 2021

XL Batteries has been accepted into Third Derivative

Founded by Rocky Mountain Institute and New Energy Nexus, Third Derivative seeks to accelerate the path to a clean future worldwide by guiding and supporting climate tech entrepreneurs who are bringing new ideas and innovation to market.
May 2020

XL Batteries is awarded a Phase I SBIR grant
from the National Science Foundation.
Learn more >

June 2019

XL Batteries wins “Most Disruptive Company” at New York Energy Week 2019.

April 2019

Raised $2M in seed funding. 
More about our partners >

April 2019

XL Batteries selected for
the START-UP NY Program.

March 2019

Tom Sisto and Anouck Champsaur offered positions in Cohort 3 of the Chain Reaction Innovations (CRI) entrepreneurship program at U.S. Department of Energy’s (DOE’s) Argonne National Laboratory.

CRI helps innovators develop transformative energy solutions and de-risk their technologies.


December 2018

XL Batteries selected for PowerBridgeNY‘s Bootcamp. PowerBridgeNY is funded by the New York State Energy Research and Development Authority (NYSERDA).

This accelerator helps entrepreneurs commercialize their cleantech inventions.