SIXTH AMENDMENT
                       TO FINANCING AND SECURITY AGREEMENT

     THIS SIXTH AMENDMENT TO FINANCING AND SECURITY AGREEMENT (this "Amendment")
is made as of this 16th day of April,  1997, 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 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.






     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.   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  Fifteen
          Million  Dollars  ($15,000,000)  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 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 Fifteen Million Dollars  ($15,000,000),  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).  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.

                                      -2-




               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 pro-
          visions 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 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.

                                      -3-




     b. Section 6.2.7 on page 111 of the Credit  Agreement is hereby  amended to
permit a one-time  only  increase in the  maximum  amount of  permitted  Capital
Expenditures to Twenty Million Dollars  ($20,000,000) for the fiscal year ending
January 31, 1998.  Any unused  portion of this increase  above the Eight Million
Dollars  ($8,000,000)  currently  permitted  for Capital  Expenditures  for such
fiscal year,  shall not be added to or  constitute  a part of the Carry  Forward
Amount  allowed under Section  6.2.7.  For all fiscal years ending after January
31,  1998,  the Capital  Expenditure  Ceiling  shall remain equal to the amounts
currently permitted under Section 6.2.7.

     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 to the Agent (1) the original stock  certificates  issued by LH Research
to C&D Charter, together with fully executed, irrevocable blank stock powers for
all such stock  certificates  and (2) an opinion of counsel from the  Borrowers'
counsel and  satisfactory  to the Agent and its counsel,  required in connection
with the execution and delivery of the Third Amendment to Financing and Security
Agreement  dated March 13, 1996, 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).

     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.

                                      -4-


     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 Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


ATTEST:                                 C&D CHARTER POWER SYSTEMS, INC.

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


ATTEST:                                 INTERNATIONAL POWER SYSTEMS, INC.

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


ATTEST:                                 RATELCO ELECTRONICS, INC.

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


ATTEST:                                 C&D/CHARTER HOLDINGS, INC.

/s/ Kerry M.Kane                        By: /s/ Robert Marley           (Seal)
- -----------------                          ----------------------------
Name: Kerry Kane                        Name: Robert T. Marley
Title: President                        Title: Vice President


ATTEST:                                 CHARTER POWER OF CALIFORNIA

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President

                                       -5-



ATTEST:                                 POWER CONVERTIBLES CORPORATION

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President



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

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


ATTEST:                                 POWER CONVERTIBLES IRELAND LIMITED

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


ATTEST:                                 LH RESEARCH, INCORPORATED

/s/ Robert Marley                       By: /s/ Stephen E. Markert, Jr. (Seal)
- -----------------                          ----------------------------
Name:                                   Name:
Title: Treasurer                        Title: Vice President


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

/s/ Stacy L. Denson                     By: /s/ Patrick M. Moore        (Seal)
- -------------------                        ----------------------------
    Stacy L. Denson                     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)
- -------------------                        ----------------------------
    Stacy L. Denson                     Name: Patrick M. Moore
                                        Title: Vice President


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

/s/                                     By: /s/ Karl F. Schultz         (Seal)
- -----------------                          ----------------------------
                                        Name: Karl F. Schultz
                                        Title: Vice President

                                      -6-



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

/s/ Shary Seaburg                       By: /s/ G. Steven Kalin         (Seal)
- -----------------                          ----------------------------
    Shary Seaburg                       Name: G. Steven Kalin
                                        Title: 






































                                      -7-