Exhibit 99.1

April 2, 2023

Dear Leah,

Please accept this letter of resignation from my role of CEO and Director of Battalion Oil effective April 2, 2023. I am also acknowledging that there were no disagreements between me and the Board that prompted this decision.I want to especially thank you and the rest of the Battalion Oil team for all you do to make Battalion Oil a successful company. I am proud of the work we have done and all that we have been able to achieve together as a team. I wish the company and everyone there all of the best in the future.Sincerely,

/s/ Richard H. Little

Richard H. Little