UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 Current Report
     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

               Date of Report (Date of earliest event reported):

                                 April 27, 2005

                            ULTRALIFE BATTERIES, INC.
             (Exact name of registrant as specified in its charter)

                                    Delaware
         (State or other jurisdiction of incorporation or organization)

        0-20852                                          16-1387013
        -------                                          ----------
(Commission File Number)                    (I.R.S. Employer Identification No.)

                 2000 Technology Parkway, Newark, New York 14513
               (Address of principal executive offices) (Zip Code)

                                 (315) 332-7100
              (Registrant's telephone number, including area code)


Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act
    (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act
    (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the
    Exchange Act (17 CFR 240.14d-2(b)

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the
    Exchange Act (17 CFR 240.13e-4(c))

Item 7.01. Regulation FD Disclosure. Ultralife Batteries, Inc. (the "Company") announced that it will report its first quarter 2005 results for the period ended April 2, 2005 before the market opens on Thursday, May 5, 2005. The Company's press release is attached as Exhibit 99.1 to this Form 8-K, and the information set forth therein is furnished under Item 7.01. Item 9.01. Financial Statements, Pro Forma Financials and Exhibits. (a) Financial Statements of Business Acquired. Not applicable. (b) Pro Forma Financial Information. Not applicable. (c) Exhibits. 99.1 Press Release dated April 27, 2005. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ULTRALIFE BATTERIES, INC. Dated: April 27, 2005. By: /s/ Robert W. Fishback --------------------------- Vice President of Finance & CFO

INDEX TO EXHIBITS (99) Additional Exhibits 99.1 Press Release dated April 27, 2005.

                                                                    Exhibit 99.1

      Ultralife Batteries to Report First Quarter Results on May 5, 2005;
    Investor Conference Call to be Webcast at Ultralife Batteries' Web Site

     NEWARK, N.Y.--(BUSINESS WIRE)--April 27, 2005--Ultralife Batteries, Inc.
(NASDAQ: ULBI) will report its first quarter 2005 results for the period ended
April 2, 2005 before the market opens on Thursday, May 5, 2005. Ultralife
management will host an investor conference call at 10:00 AM ET also on May 5,
2005. Investors are invited to access a live webcast of the conference call in
the Investor Info - Event Calendar section of the company's website:
http://www.investor.ultralifebatteries.com. A replay of the webcast will be
available shortly after the call at the same location and will be archived for
90 days.

     About Ultralife Batteries, Inc.

     Ultralife is a global provider of power solutions for diverse applications.
The company develops, manufactures and markets a wide range of non-rechargeable
and rechargeable batteries, charging systems and accessories for use in
military, industrial and consumer portable electronic products. Through its
range of standard products and engineered solutions, Ultralife is able to
provide the next generation of power systems. Industrial, retail and government
customers include General Dynamics, Philips Medical Systems, Energizer, Kidde
Safety, Lowe's, Radio Shack and the national defense agencies of the United
States and United Kingdom, among others.
     Ultralife's headquarters, principal manufacturing and research facilities
are in Newark, New York, near Rochester. Ultralife (UK) Ltd., a second
manufacturing facility, is located in Abingdon, England. Both facilities are
ISO-9001 certified.
     Detailed information on Ultralife is available at the Company's web site,
www.ultralifebatteries.com.


     CONTACT: Ultralife Batteries, Inc.
              Robert W. Fishback, 315-332-7100
              bfishback@ulbi.com
              or
              Lippert/Heilshorn & Associates, Inc.
              Investor Relations:
              Jody Burfening, 212-838-3777
              jburfening@lhai.com
              or
              Media Contact:
              Chenoa Taitt, 212-201-6635
              ctaitt@lhai.com