FOURTH AMENDMENT
                       TO FINANCING AND SECURITY AGREEMENT

     THIS  FOURTH   AMENDMENT  TO  FINANCING   AND  SECURITY   AGREEMENT   (this
"Amendment") is made as of this 3rd day of September, 1996, by and among CHARTER
POWER SYSTEMS,  INC., a corporation organized and existing under the laws of the
State of  Delaware  ("Charter  Power"),  C&D  CHARTER  POWER  SYSTEMS,  INC.,  a
corporation organized and existing under the laws of the State of Delaware ("C&D
Charter"),  INTERNATIONAL  POWER  SYSTEMS,  INC., a  corporation  organized  and
existing  under  the laws of the  State of  Arizona  ("International"),  RATELCO
ELECTRONICS,  INC., a corporation  organized and existing  under the laws of the
State  of  Delaware  ("Ratelco"),  C&D/CHARTER  HOLDINGS,  INC.,  a  corporation
organized  and  existing  under  the  laws of the  State of  Delaware  ("Charter
Holdings"),  CHARTER POWER OF CALIFORNIA,  a corporation  organized and existing
under  the  laws  of the  State  of  California  ("Charter  California"),  POWER
CONVERTIBLES CORPORATION, a corporation organized and existing under the laws of
the State of Arizona ("PCC"),  PCC DE MEXICO S.A. DE C.V. ("PCC Mexico"),  POWER
CONVERTIBLES  IRELAND LIMITED ("PCC Ireland") and LH RESEARCH,  INCORPORATED,  a
corporation  organized and existing under the laws of the State of Delaware ("LH
Research") (Charter Power, C&D Charter, International, Ratelco, Charter Holdings
and Charter California,  PCC, PCC Mexico, PCC Ireland and LH Research are herein
collectively  referred to as the "Borrowers" and  individually as a "Borrower");
NATIONSBANK,  N.A., a national banking association,  in its capacity as a lender
("NationsBank"),   FLEET  BANK,   NATIONAL   ASSOCIATION,   a  national  banking
association and successor in interest to NatWest Bank N.A., being formerly known
as National  Westminster  Bank NJ ("Fleet"),  CORESTATES  BANK, N.A., a national
banking  association  ("CoreStates")  (NationsBank,  CoreStates,  and  Fleet are
herein  collectively  referred  to  as  the  "Lenders"  and  individually,  as a
"Lender");  and  NATIONSBANK,  N.A.,  a  national  banking  association,  in its
capacity as agent for the Lenders (the "Agent"); Witnesseth:

                                    RECITALS

     A. The  Lenders,  the  Borrowers  and the Agent are parties to that certain
Financing and Security Agreement dated September 26, 1994 (as amended, restated,
supplemented or otherwise modified,  the "Credit Agreement").  Under and subject
to the  provisions  of the Credit  Agreement,  the Lenders  agreed to  establish
jointly and severally in favor of the Existing  Borrowers (i) a revolving credit
facility in a maximum principal amount not to exceed SIXTY-FIVE  MILLION DOLLARS
($65,000,000) (the "Total Revolving Credit Committed Amount"),  (ii) a term loan
facility (collectively, the "Term Loans") in an original principal amount not to
exceed FIFTEEN  MILLION  DOLLARS  ($15,000,000)  (the "Total Term Loan Committed
Amount") and (iii) a letter of credit  facility as part of the Revolving  Credit
Facility (the "Letter of Credit  Facility") in a maximum principal amount not to
exceed EIGHT  MILLION  DOLLARS  ($8,000,000)  (the  "Letter of Credit  Committed
Amount").



     B. The  Borrowers  have  requested  that the Lenders and the Agent agree to
amend certain terms and conditions of the Credit  Agreement,  and subject to the
provisions  of this  Amendment,  the  Lenders  and  the  Agent  have so  agreed;
provided,  that  the  Borrowers  execute  and  deliver  this  Amendment  and the
Borrowers furnish to the Agent such information, items, certifications and other
documents as the Agent and/or any of the Lenders may reasonably request to close
and  consummate  any of the  transactions  contemplated  by  this  Amendment  or
otherwise by the Credit Agreement.

     NOW,  THEREFORE,  in  consideration  of the  premises  and  other  good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the Borrowers, the Lenders and the Agent hereby agree as follows:

     1. The  recitals  set forth  above are true and  accurate in each and every
respect and are  incorporated  herein by reference.  All capitalized  terms used
herein but not  specifically  defined herein shall have the respective  meanings
given such terms in the  Credit  Agreement,  unless  the  context  indicates  or
dictates a contrary meaning.

     2. The Credit Agreement is hereby amended as follows:

          a. The definition of "Revolving  Credit Expiration Date" on page 28 of
the Credit  Agreement  is hereby  amended to mean  January 31,  1999,  as may be
further  extended in accordance  with the  provisions of Section  2.1.9.  of the
Credit Agreement.

          b. Section 2.1.7 on page 38 of the Credit  Agreement is hereby deleted
in its entirety and the following is substituted in its place:

               2.1.7  REVOLVING  CREDIT  UNUSED LINE FEE.  The  Borrowers  shall
          jointly and  severally pay to the Agent,  in arrears,  for the ratable
          benefit of the Lenders,  a quarterly  revolving credit unused line fee
          (collectively,   the   "Revolving   Credit   Unused   Line  Fees"  and
          individually, a "Revolving Credit Unused Line Fee") in an amount to be
          determined  based  upon the  ratio of Funded  Debt to  EBITDA  for the
          rolling four (4) quarter month period  covered by the then most recent
          financial  statements  furnished  or required to be  furnished  to the
          Agent  pursuant to and in the form  required by Section  6.1.1(a)  and
          Section  6.1.1(c).  Within  three  (3)  Business  Days of the  Agent's
          receipt of such financial  statements in the form required,  the Agent
          shall  calculate  the  ratio of  Funded  Debt to  EBITDA  for the then
          rolling four (4) quarter period covered by such financial  statements,
          and shall notify the Borrowers  and the Lenders of its  determination.
          If such  financial  statements are not furnished as and when required,
          the  Borrowers  may not be  permitted  to select or change an Interest
          Rate or an

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          Interest Period.  Following,  the Agent's  determination of the Funded
          Debt to EBITDA ratio, the Revolving Credit Unused Line Fee shall be as
          follows:

            FUNDED DEBT TO EBITDA RATIO                 FEE AMOUNT
            ---------------------------                 ----------

            Less than 1.0 to 1.0                        .125%

            Greater than or equal to                    .15%
            1.0 to 1.0, but less than
            1.75 to 1.0

            Greater than or equal to                    .18%
            1.75 to 1.0, but less than
            2.25 to 1.0

            Greater than or equal to                    .22%
            2.25 to 1.0, but less than
            2.75 to 1.0

            Greater than or equal to                    .25%
            2.75 to 1.0, but not more
            than 3.0 to 1.0

            Greater than or equal to
            3.0 to 1.0                                  .50%

          c.  Section  2.1.11 of the  Credit  Agreement  (as added by the Second
Amendment to Financing and Security  Agreement dated January 26, 1996) is hereby
deleted in its entirety and the following is substituted in its place:

          2.1.11  CONVERSION  OF REVOLVING  LOAN  ADVANCES FOR STOCK  PURCHASES;
          MANDATORY REDUCTIONS IN TOTAL REVOLVING CREDIT FACILITY. The Borrowers
          jointly  and  severally  covenant  and  agree  that if at any time the
          aggregate principal amount of Revolving Loan advances used to purchase
          Stock at any  time and from  time to time  equals  or  exceeds  Twelve
          Million  Dollars  ($12,000,000)  and such aggregate  principal  amount
          (each a "Stock  Purchase  Advance")  has not yet been  converted  to a
          Converted Stock Loan in accordance with the provisions of this Section
          2.1.11,  that portion of the Stock Purchase Advance in excess of Seven
          Million  Dollars  ($7,000,000)  shall be  converted  into a term  loan
          having a maturity  date which is three (3) years  after the  effective
          date of the conversion  (each referred to herein as a "Converted Stock
          Loan");  provided  that (i) all Stock  purchased  with the proceeds of
          such Stock Purchase Advance shall have been purchased by Charter Power
          in accordance  with the provisions of Section 6.2.4 of this Agreement,
          (ii) there shall not exist a Default or an Event of Default under

                                       3


          this Agreement as of the effective date of such conversion,  and (iii)
          the Borrowers  shall have executed and delivered to the Agent a series
          of promissory notes (as from time to time extended, amended, restated,
          supplemented or otherwise  modified,  the "Converted  Stock Notes" and
          individually a "Converted  Stock Note")  substantially  in the form of
          Exhibit  A-3  attached  to and  made a part  of this  Agreement,  with
          appropriate  insertions  and such other  documents as the Agent and/or
          any of the Lenders may  reasonably  require to confirm the validity of
          the Obligations,  as converted,  and any Liens and security interests.
          Each Lender's  Converted  Stock Note shall be dated as of the date the
          Stock Purchase  Advance,  in part  evidenced by such  Converted  Stock
          Note, equals or exceeds Twelve Million Dollars ($12,000,000), shall be
          payable  to the  order of such  Lender at the  times  provided  in the
          Converted  Stock Note,  and shall be in the  principal  amount of such
          Lender's  Proportionate  Share of that portion of the respective Stock
          Purchase   Advance   exceeding  Seven  Million  Dollars   ($7,000,000)
          evidenced,  in  part,  by  such  Converted  Stock  Note.  If as of the
          effective date of any proposed  conversion the Borrowers  would not be
          entitled to convert any Stock  Purchase  Advance to a Converted  Stock
          Loan,  such  Stock  Purchase  Advance,  together  with any  unpaid and
          accrued  interest  thereon,  shall be payable jointly and severally by
          the Borrowers ON DEMAND.

          The unpaid  principal  balance of each Converted Stock Loan shall bear
          interest at a floating and  fluctuating  rate of interest equal to the
          Interest Rate or Interest  Rates then available for the Converted Term
          Loan, as selected by the Borrowers in accordance  with the  provisions
          of Section 2.4. The unpaid  principal  balance of each Converted Stock
          Loan, together with unpaid and accrued interest thereon,  shall be due
          and payable in consecutive quarterly  installments on the first day of
          each quarterly  period  commencing  with the first such date following
          the effective date of the Converted  Stock Loan; the principal  amount
          of each  such  quarterly  installment  shall  be  sufficient  to fully
          amortize  the  principal  balance  of  the  Converted  Stock  Loan  in
          approximately equal quarterly  principal  installments by the maturity
          date of such Converted Stock Loan.

          Subject to the terms of Section  2.4.5 of the  Credit  Agreement,  the
          Borrowers  may,  at their  option,  at any time and from time to time,
          prepay, the Converted Stock

                                       4


          Loans, in whole or in part, upon at least five (5) Business Days prior
          written  notice to the  Agent,  specifying  the date and amount of the
          proposed  prepayment.  Subject  to the terms of  Section  2.4.5 of the
          Credit Agreement,  each Converted Stock Note may be prepaid,  in whole
          or in part,  without  premium or  penalty.  The amount to be  prepaid,
          together with unpaid and accrued  interest thereon through the date of
          prepayment if the prepayment is intended to prepay the Converted Stock
          Loans in whole,  shall be paid by the  Borrowers  to the Agent for the
          ratable  benefit  of  the  Lenders  on the  date  specified  for  such
          prepayment.  Partial  prepayments  shall be in an amount not less than
          Two Hundred Thousand Dollars  ($200,000) and shall be applied first to
          all  unpaid  and  accrued  late  charges,  second  to any  unpaid  and
          outstanding Enforcement Costs, third to any billed and unpaid interest
          on the  Converted  Stock  Loans,  and then to  principal  against  the
          principal installments in the inverse order of their maturities.

          The Total Revolving Credit Committed Amount shall be automatically and
          permanently  reduced by the principal  amount of each Converted  Stock
          Loan as of the effective date of such Converted  Stock Loan. If, after
          giving  effect to any such  reduction  in the Total  Revolving  Credit
          Committed  Amount,  the  then  outstanding  principal  amount  of  the
          Revolving Loan exceeds the Total Revolving  Credit Committed Amount as
          so   reduced,    the   Borrowers    jointly   and   severally    shall
          contemporaneously  with such reduction (a) make a mandatory prepayment
          of the Revolving Loan in the amount of such excess, and (b) pay to the
          Agent for the ratable benefit of the Lenders an amount equal to unpaid
          interest on the amount of such excess and the pro rata  portion of the
          Revolving Credit Unused Line Fee accrued to the date of such mandatory
          prepayment.  After each such  reduction,  the Revolving  Credit Unused
          Line Fee shall be  calculated  with  respect  to the  Total  Revolving
          Credit Committed Amount as so reduced.

          For purposes of this Agreement, all Stock purchases shall be deemed to
          have been financed with the proceeds of the Revolving Loan, regardless
          of the actual source of funds for the purchase.

          d.  Subsections  (b) and (c) of Section 2.3.2 on page 43 of the Credit
Agreement  are hereby  amended to provide  that the Letter of Credit Fee for any
Letter of Credit (other than the

                                       5


Rockdale Letter of Credit and the PEDFA Obligations) shall be in an amount equal
to one and  one-eighth  percent  (1-1/8%)  per annum of the face  amount of such
Letter of Credit.

          e. Section  2.4.1(b)(i) on pages 55 and 56 of the Credit  Agreement is
hereby deleted in its entirety and the following is substituted in its place:

          (i) with respect to advances under the Revolving  Loan, the Applicable
          Margin to be added when calculating the available Interest Rates shall
          be as follows:

            FUNDED DEBT TO EBITDA RATIO                 APPLICABLE MARGIN
            ---------------------------                 -----------------

            Less than 1.0 to 1.0                        LIBOR Loans: .60%
                                                        Prime Loans: -.40%

            Greater than or equal to                    LIBOR Loans: .75%
            1.0 to 1.0, but less than                   Prime Loans: -.25%
            1.75 to 1.0

            Greater than or equal to                    LIBOR Loans: .95%
            1.75 to 1.0, but less than                  Prime Loans: 0%
            2.25 to 1.0

            Greater than or equal to                    LIBOR Loans: 1.25%
            2.25 to 1.0, but less than                  Prime Loans:  .25%
            2.75 to 1.0

            Greater than or equal to                    LIBOR Loans: 1.60%
            2.75 to 1.0, but less than                  Prime Loans:  .60%
            3.0 to 1.0

          The initial Interest Rate adjustment, if any, shall be effective as of
          September  1, 1996 if and to the  extent  the ratio of Funded  Debt to
          EBITDA  as  set  forth  above   results  in  any  such  Interest  Rate
          adjustment.

          f. Section  2.4.1(b)(iv) on pages 56 of the Credit Agreement is hereby
deleted in its entirety and the following is substituted in its place:

          (iv) If the ratio of Funded Debt to EBITDA at any time  exceeds 3.0 to
          1.0 all Loans  (including the Converted Term Loan) shall bear interest
          at the Post-Default Rate.

                                       6


          g. Section  2.4.1(d) of the Credit  Agreement  (as added by the Second
Amendment to Financing and Security  Agreement dated January 26, 1996) is hereby
deleted in its entirety.  For purposes of calculating  Interest Rates  available
under the Credit  Agreement  at any time after the date of this  Amendment,  the
Stock Margin shall be equal to zero.

          h. Section 6.1.15 on page 99 of the Credit Agreement is hereby deleted
in its entirety and the following is substituted in its place:

          6.1.15  LIABILITIES  TO  TANGIBLE  NET WORTH.  The  Borrowers  and the
          Restricted Subsidiaries,  on a Consolidated basis and as of the end of
          each fiscal  quarter,  commencing  with the first such fiscal  quarter
          ending on or after July 31, 1996, shall have a ratio of Liabilities to
          Tangible Net Worth of not more than 2.25 to 1.0.

          i. Section 6.1.17 on page 99 of the Credit Agreement is hereby deleted
in its entirety and the following is substituted in its place:

          6.1.17 FIXED CHARGE COVERAGE  RATIO.  The Borrowers and the Restricted
          Subsidiaries, on a Consolidated basis and as of the end of each fiscal
          quarter,  commencing  with the first such fiscal  quarter ending on or
          after July 31, 1996,  shall have a Fixed Charge  Coverage Ratio of not
          less  than  1.5 to 1.0.  The  Fixed  Charge  Coverage  Ratio  shall be
          calculated on a rolling four (4) quarter basis.

     3. The terms,  conditions  and  provisions of this  Amendment  shall not be
effective until each of the following  conditions  precedent have been satisfied
fully to the extent and in the manner required by the Agent:  (i) the Borrowers,
the Agent and the Lenders execute and deliver this Amendment, (ii) the Borrowers
furnish or cause to be furnished to the Agent all of the items to be provided by
the  Borrowers  as listed in the "List of  Closing  Documents"  prepared  by the
Agent's counsel and previously furnished to the Borrowers in connection with the
Third Amendment to Financing and Security Agreement dated March 13, 1996, and as
more particularly indicated in Exhibit A attached hereto and made a part hereof,
and  (iii)  the  Borrowers  shall  have  reimbursed  the  Agent for all fees and
expenses  reasonably  incurred by the Agent in connection with the  transactions
contemplated by this Amendment (including,  without limitation,  attorneys' fees
and expenses).

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     4. The terms "this Agreement" as used in the Credit Agreement and the terms
"Credit  Agreement"  as used in any of the  Financing  Documents  shall mean the
Credit  Agreement as modified  herein  unless the context  clearly  indicates or
dictates a contrary meaning.

     5. The Borrowers will execute such confirmatory instruments with respect to
the Credit  Agreement  and/or any of the  Financing  Documents  as the Agent may
reasonably require.

     6. The Borrowers ratify and confirm all of their respective liabilities and
obligations  under the Credit  Agreement  and agree  that,  except as  expressly
modified in this  Amendment,  the Credit  Agreement  continues in full force and
effect as if set forth  specifically  herein.  The Borrowers,  the Agent and the
Lenders  agree that this  Amendment  shall not be  construed  as an agreement to
extinguish  the original  obligations  under the Credit  Agreement and shall not
constitute  a novation  as to any of the joint and  several  obligations  of the
Borrowers under the Credit Agreement.

     7.  This  Amendment  may not be  amended,  changed,  modified,  altered  or
terminated  without in each instance the prior written consent of the Agent, the
Lenders and the Borrowers. This Amendment shall be construed in accordance with,
and governed by, the laws of the State of Maryland.

     8. The  Borrowers  agree that  neither the  execution  and delivery of this
Amendment nor any of the terms,  provisions,  covenants, or agreements contained
in this  Amendment  shall in any  manner  release,  impair,  lessen,  waive,  or
otherwise  adversely  affect the joint and several  liability and obligations of
the Borrowers under the terms of the Credit Agreement.

     9. This  Agreement may be executed in any number of duplicate  originals or
counterparts,  each of such duplicate  originals or counterparts shall be deemed
to be an original and all taken together  shall  constitute but one and the same
instrument.

     IN WITNESS  WHEREOF,  the Borrowers,  the Agent and the Lenders have caused
this Amendment to be executed under seal as of the date first above written.

ATTEST:                             CHARTER POWER SYSTEMS, INC.


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:   Treasurer                  Title:

                                       8


ATTEST:                             C&D CHARTER POWER SYSTEMS, INC.


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:   Treasurer                  Title:  V. Pres.


ATTEST:                             INTERNATIONAL POWER SYSTEMS, INC.


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:   Treasurer                  Title: V. Pres.


ATTEST:                             RATELCO ELECTRONICS, INC.


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:   Treasurer                  Title: V. Pres


ATTEST:                             C&D/CHARTER HOLDINGS, INC.


/s/ STEPHEN E. MARKERT, JR.         By: /s/ ROBERT T. MARLEY     (Seal)
Name:                               Name:
Title: Director                     Title: Vice President


ATTEST:                             CHARTER POWER OF CALIFORNIA


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:   Treasurer                  Title: V. Pres


ATTEST:                             POWER CONVERTIBLES CORPORATION


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:                              Title:  Treasurer

                                       9




ATTEST:                             PCC DE MEXICO S.A. DE C.V.


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:                              Title:


ATTEST:                             POWER CONVERTIBLES IRELAND LIMITED


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:                              Title:


ATTEST:                             LH RESEARCH, INCORPORATED


 /s/ ROBERT T. MARLEY               By:/s/ STEPHEN E. MARKERT, JR.(Seal)
Name:                               Name:
Title:   Treasurer                  Title:  V. Pres


WITNESS:                            NATIONSBANK, N.A.
                                    in its capacity as Agent


 /s/ STACY L. DENSON                By: /s/PATRICK M. MOORE      (Seal)
                                    Name:  Patrick M. Moore
                                    Title: Vice President


WITNESS:                            NATIONSBANK, N.A.
                                    in its capacity as a Lender


 /s/ STACY L. DENSON                By: /s/ PATRICK M. MOORE     (Seal)
                                    Name:  Patrick M. Moore
                                    Title: Vice President


WITNESS:                            CORESTATES BANK, N.A.
                                    in its capacity as a Lender


 /s/ JOHN GERHART                   By: /s/ KARL F. SCHULTZ      (Seal)
                                    Name:Karl F. Schultz
                                    Title:Vice President

                                       10



WITNESS:                            FLEET BANK, NATIONAL ASSOCIATION
                                    (formerly known as NatWest Bank
                                    N.A.) in its capacity as a Lender


_________________________           By: /s/ GARY P. KEARNS       (Seal)
                                    Name:  Gary P. Kearns
                                    Title: SVP






                                       11