SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 12b-25
                                                 Commission File Number: 0-20852

                           NOTIFICATION OF LATE FILING

(Check One):    [X] Form 10-K and Form 10-KSB    [ ] Form 11-K     [ ] Form 20-F
                [ ] Form 10-Q and Form 10-QSB    [ ] Form N-SAR

For Period Ended:  June 30, 1998

[ ]  Transition Report on Form 10-K and    [ ]  Transition Report on Form 10-Q
     Form 10-KSB                                and Form 10-QSB
[ ]  Transition Report on Form 20-F        [ ]  Transition Report on Form N-SAR
[ ]  Transition Report on Form 11-K

For the Transition Period Ended:________________________________________________

      Read attached  instruction  sheet before  preparing form.  Please print or
type.

      Nothing in this form shall be construed to imply that the  Commission  has
verified any information contained herein.

      If the  notification  relates to a portion of the  filing  checked  above,
identify the Item(s) to which notification relates:_____________________________
________________________________________________________________________________

                         Part I. Registrant Information

Full name of Registrant:    ULTRALIFE BATTERIES, INC.

Former name if applicable:  N/A

Address of principal executive office (Street and number):  1350 Route 88 South

City, State and Zip Code:  Newark, New York  14513

                         Part II. Rule 12b-25(b) and (c)

      If the subject  report could not be filed without  unreasonable  effort or
expense  and  the  Registrant  seeks  relief  pursuant  to Rule  12b-25(b),  the
following should be completed. (Check appropriate box.)

[X]   (a)   The reasons  described in reasonable detail in Part III of this form
            could not be eliminated without unreasonable effort or expense;

[X]   (b)   The subject annual report,  semi-annual report, transition report on
            Forms 10-K,  10-KSB,  20-F,  11-K or Form N-SAR,  or portion thereof
            will be filed on or  before  the 15th  calendar  day  following  the
            prescribed due date; or the subject  quarterly  report or transition
            report on Form 10-Q,  10-QSB, or portion thereof will be filed on or
            before the fifth calendar day following the prescribed due date; and



[ ]   (c)   The  accountant's  statement  or  other  exhibit  required  by  Rule
            12b-25(c) has been attached if applicable.

                               Part III. Narrative

      State below in reasonable detail the reasons why Forms 10-K, 10-KSB, 11-K,
20-F, 10-Q, 10-QSB,  N-SAR or the transition report portion thereof could not be
filed within the prescribed time period. (Attach extra sheets if needed.)

      Ultralife Batteries,  Inc. (the "Company") has been devoting substantially
all of its efforts to the continuing  development of its business.  Accordingly,
it was not able to file its Form 10-K with  respect  to the year  ended June 30,
1998 on or prior to September 28, 1998 without  unreasonable  effort or expense,
however, the Company is filing its Form 10-K contemporaneously herewith.

                           Part IV. Other Information

      (1) Name and  telephone  number  of person  to  contact  in regard to this
notification.

           Michael L. Pflaum, Esq.                    (212)  702-5761
                  (Name)                     (Area code and telephone number)

      (2) Have all other periodic  reports required under Section 13 or 15(d) of
the Securities  Exchange Act of 1934 or Section 30 of the Investment Company Act
of 1940  during the  preceding  12 months or for such  shorter  period  that the
Registrant was required to file such report(s) been filed?  If the answer is no,
identify report(s).
                                                             [X] Yes   [ ] No

      (3) Is it anticipated that any significant change in results of operations
from the corresponding  period for the last fiscal year will be reflected by the
earnings statements to be included in the subject report or portion thereof? 
                                                             [ ] Yes   [X] No

      If so: attach an explanation of the anticipated  change,  both narratively
and  quantitatively,  and, if  appropriate,  state the reasons why a  reasonable
estimate of the results cannot be made.

                            ULTRALIFE BATTERIES, INC.
                  (Name of Registrant as specified in charter)

Has  caused  this  notification  to be signed on its  behalf by the  undersigned
thereunto duly authorized.

Date: September 28, 1998            By: /s/ Frederick F. Drulard
                                        ----------------------------------------
                                        Frederick F. Drulard
                                        Vice President, Finance & 
                                        Chief Financial Officer

                                    ATTENTION

Intentional  misstatements  or omissions  of fact  constitute  Federal  criminal
violations (see 18 U.S.C. 1001).