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 20, 2006

                            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))

                                       1

Item 2.02. Results of Operations and Financial Condition. Ultralife Batteries, Inc. (the "Company") will report its first quarter 2006 results for the period ended April 1, 2006 before the market opens on Thursday, May 4, 2006. Ultralife management will host an investor conference call at 10:00 AM ET also on May 4, 2006. 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 2.02. 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 20, 2006. 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 20, 2006. By: /s/ Robert W. Fishback -------------------------- Vice President of Finance & CFO 2

INDEX TO EXHIBITS (99) Additional Exhibits 99.1 Press Release dated April 20, 2006. 3

                                                                    Exhibit 99.1

       Ultralife Batteries to Report First Quarter Results on May 4, 2006;
     Investor Conference Call to Be Webcast at Ultralife Batteries' Web Site


     NEWARK, N.Y.--(BUSINESS WIRE)--April 20, 2006--Ultralife Batteries, Inc.
(NASDAQ: ULBI) will report its first quarter 2006 results for the period ended
April 1, 2006 before the market opens on Thursday, May 4, 2006. Ultralife
management will host an investor conference call at 10:00 AM ET also on May 4,
2006. 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://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 high-energy power systems 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 portfolio of standard products and engineered solutions, Ultralife
is at the forefront of providing the next generation of power systems.
Industrial, retail and government customers include General Dynamics, Philips
Medical Systems, General Motors, Energizer, Kidde Safety, Lowe's, Radio Shack
and the national defense agencies of the United States, United Kingdom, Germany
and Australia, among others.
     Ultralife's headquarters, principal manufacturing and research facilities
are in Newark, New York, near Rochester. Ultralife Batteries (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
             Investor Relations:
             Lippert/Heilshorn & Associates, Inc.
             Jody Burfening, 212-838-3777
             jburfening@lhai.com
              OR
             Media:
             Lippert/Heilshorn & Associates, Inc.
             Chenoa Taitt, 212-838-3777
             ctaitt@lhai.com