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

                                    FORM 8-K

     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

                Date of Report (Date of earliest event reported):

                               September 24, 2004

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

                                    Delaware
                                    --------
         (State or other jurisdiction of incorporation or organization)

           0-202452                             16-132424013
           --------                             ------------
   (Commission File Number)         (I.R.S. Employer Identification No.)
   ------------------------         ------------------------------------

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

                                 (315) 332-24100
                                 ---------------
              (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
    (124 CFR 240.425)

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

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the
    Exchange Act (124 CFR 240.14d-2(b)

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the
    Exchange Act (124 CFR 240.13e-4(c))

Item 7.01. Regulation FD Disclosure. The Company will host an Analyst and Investor Day for institutional investors and analysts on September 28, 2004 at the company's facilities in Newark, NY. Refer to the attached Exhibit 99.1 for the entire text of the release, which Exhibit is being furnished but not filed in accordance with Regulation FD. 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 September 24, 2004 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: September 24, 2004 By: /s/ Robert W. Fishback ---------------------------------- Robert W. Fishback Vice President Finance & CFO

Index to Exhibits (99) Additional Exhibits 99.1 Press Release dated September 24, 2004

                                                                    Exhibit 99.1

        Ultralife Batteries Inc. Announces 2004 Analyst and Investor Day

    NEWARK, N.Y.--(BUSINESS WIRE)--Sept. 24, 2004--Ultralife
Batteries, Inc. (NASDAQ:ULBI) will host an Analyst and Investor Day
for institutional investors and analysts on September 28, 2004 at the
company's facilities in Newark, NY.
    The agenda includes management presentations on: short and
long-term objectives, markets, product development process, and a
financial overview.
    The event will take place from 12 noon to 5:00 PM Eastern Daylight
Time. Attendance at the event is by invitation only, however, a replay
of the presentation will be available by the end of the day on
September 29th in the Investor Relations section of the company's
website, http://www.ultralifebatteries.com/.

    About Ultralife Batteries, Inc.

    Ultralife is a leading developer, manufacturer, and marketer of
standard and customized lithium primary (non-rechargeable), lithium
ion and lithium polymer rechargeable batteries. Ultralife's
high-energy batteries use advanced lithium technology and are used in
military, industrial and consumer portable electronic products.
Through its range of standard products and ability to customize for a
wide range of applications, Ultralife is able to provide the next
generation of battery solutions. OEM, retail and government customers
include Energizer, Kidde Safety, Philips Medical Systems, 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 and research facility, is located in
Abingdon, U.K. Both facilities are ISO-9001 certified.

    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
             Seema Brin, 212-838-3777
             sbrin@lhai.com
             or
             Media:
             Chenoa Taitt, 212-201-6635
             ctaitt@lhai.com