Document:

EXHIBIT 10.30

Summary of Guaranty Contract of Maximum Amount Pledge ("Guaranty Contract 1") by
and between Li Xiangqian and Development Bank dated as of April 28, 2005.

     o    Contract number: Shenfa Longgang Ezhi zi NO.20050407001-1.

     o    As  guarantor,  Li Xiangqian has pledged  19,053,887  equity shares in
          China BAK Battery Inc.,  registered under his name to Development Bank
          to  secure  the  indebtedness  of  the  Company  under   Comprehensive
          Agreement  1 which  include  the  loan  principal,  interest,  penalty
          interest,  expenses for the Development Bank to realize its creditor's
          rights,  and maximum  secured  amount for the loan principal is RMB150
          million.

     o    Applicable law of Guaranty Contract 1 is PRC law. If, according to PRC
          law,  Guaranty  Contract  1  needs  to be  registered  with  competent
          authority,  Guaranty Contract 1 shall come into effect upon completion
          of such registration;

     o    After Li Xiangqian has pledged the shares as collateral, he should not
          transfer such shares without the prior written  consent of Development
          Bank.  If  transfer  is made with the  consent  of  Development  Bank,
          proceeds  from such transfer  should be used for advance  repayment of
          the debts secured under  Guaranty  Contract 1 or be handed over to the
          escrow control of competent authority.

     o    Development  Bank is entitled to dispose the pledged shares by sale at
          a discounted price or auction and use such proceeds to repay the loans
          made under Comprehensive Agreement 1 if any of the following occurs:

          ---  The debtor  under  Comprehensive  Agreement  1 fails to repay its
               debts upon maturity;

          ---  The debtor under Comprehensive  Agreement 1 is declared dissolved
               or bankrupt;

          ---  Value of the pledged  collateral  is obviously  decreased so that
               rights  of  Development  Bank is  endangered  and Mr. Li fails to
               provide  additional  collateral  according to Development  Bank's
               request.

          ---  Occurrence of other  instances which might have a negative impact
               upon the  realization of  Development  Bank's  creditor's  rights
               under Comprehensive Agreement 1.

     o    Guaranty Contract 1 is irrevocable and independently effective.EXHIBIT 10.31

Summary of Guaranty  Contract of Maximum Amount Pledge signed by and between the
Company and Development Bank dated as of April 28, 2005 ("Guaranty Contract 2"):

     o    Contract number: Shenfa Longgang ezhi zi NO.20050407001-2.

     o    As guarantor,  the Company has pledged 6.16 million pieces of cells to
          Development  Bank to secure  the  indebtedness  of the  Company  under
          Comprehensive Agreement 1 which include the loan principal,  interest,
          penalty  interest,  expenses for the Lender to realize its  creditor's
          rights,  and maximum  secured  amount for the loan principal is RMB150
          million. The purchase price of the pledged cells is RMB 62 million.

     o    After the Company has pledged the cells as  collateral,  it should not
          sell or permit  any third  party to use such cells  without  the prior
          written consent of Development  Bank. If sale is made with the consent
          of  Development  Bank,  proceeds  from  such  sale  should be used for
          advance repayment of the debts secured under Guaranty Contract 2 or be
          handed over to the escrow control of competent authority.  Development
          Bank is entitled to dispose the pledged  cells by sale at a discounted
          price or auction  and use such  proceeds to repay the loans made under
          Comprehensive Agreement 1 if any of the following occurs:

          ---  The debtor  under  Comprehensive  Agreement  1 fails to repay its
               debts upon maturity;

          ---  The debtor under Comprehensive  Agreement 1 is declared dissolved
               or bankrupt;

          ---  The  pledged  collateral  is  damaged  or  value  of the  pledged
               collateral is obviously  decreased so that rights of  Development
               Bank is endangered  and the Company  fails to provide  additional
               collateral according to Development Bank's request;

          ---  Occurrence of other  instances which might have a negative impact
               upon the  realization of  Development  Bank's  creditor's  rights
               under Comprehensive Agreement 1.

     o    Other terms reached under Guaranty Contract 2:

          ---  During the term of the credit facilities,  if there is any change
               or  replacement  of the pledged  cells due to  discharge  from or
               storage in the  warehouse  by the  Company,  discharge or storage
               note shall automatically  become schedules of Guaranty Contract 2
               and no supplementary contract needs to be signed.

          ---  Once the market value of the pledged  cells is reduced by 10%, or
               in other words, the market value of the pledged cells drops to or
               is  lower  than  RMB55.8  million,  the  Company  should  provide
               additional   collateral   for  the  reduced   value.   Otherwise,
               Development  Bank is  entitled  to deem  such  credit  facilities
               matured  before  expiry of its term and is entitled to  authorize
               designated  organization  to sell or auction  the  pledged  cells
               under  Guaranty  Contract  2.  Proceeds  form the sale or auction
               shall be used to repay credit used by the Company.EXHIBIT 10.32

Summary of Guaranty  Contract of Maximum Amount Pledge  ("Guaranty  Contract 3")
signed by and between the  Company  and  Development  Bank dated as of April 11,
2005.

     o    Contract number: Shenfa Longgang edi zi NO.20050407001.

     o    As  guarantor,  the  Company  has  pledged  all  its  machineries  and
          equipments  to  Development  Bank to secure  the  indebtedness  of the
          Company  under  Comprehensive  Agreement  1  which  include  the  loan
          principal,  interest,  penalty  interest,  expenses  for the Lender to
          realize its creditor's rights, and maximum secured amount for the loan
          principal is RMB150  million.  Purchase price of such  machineries and
          equipments  is RMB  97.16million  while its current  value is RMB79.46
          million.

     o    During the term of Guaranty  Contract 3, the pledged  machineries  and
          equipments  shall be kept and  maintained by the Company;  if value of
          such pledged  machineries and equipments is reduced,  Development Bank
          is entitled  to request  the  Company to restore the pledged  value or
          provide additional collateral;

     o    Title certificates of the pledged  machineries and equipments shall be
          kept by Development Bank;

     o    Without  Development  Bank's  consent,  the Company is not entitled to
          transfer registered pledge collaterals,  but if transfer consideration
          is less than the pledge value, Development Bank is entitled to request
          the  Company  to provide  additional  collateral  for the  difference,
          otherwise the Company should not transfer the pledged collaterals.

     o    Proceeds for transfer of pledged collaterals shall be used in priority
          for advanced  repayment of the debts  secured or be handed over to the
          escrow control of a third party agreed by Development Bank.

     o    The Company  should  purchase  insurance  for the  pledged  collateral
          during the term of Guaranty Contract 3;

          (insurance has been purchased as required)

     o    Collaterals  under  Guaranty  Contract  3 should  be  registered  with
          competent authorities; (Registration has been done.)

     o    Development Bank is entitled to dispose the pledge collaterals by sale
          at a  discounted  price or auction and use such  proceeds to repay the
          loans made under  Comprehensive  Agreement  1 if any of the  following
          occurs:

          ---  The debtor  under  Comprehensive  Agreement  1 fails to repay its
               debts upon maturity;

          ---  The debtor under Comprehensive  Agreement 1 is declared dissolved
               or bankrupt;

          ---  The Company or any third party  disposes the pledged  collaterals
               without getting Development Bank's consent;

          ---  Behavior of the Company or any third party severely infringes the
               lawful  rights  of  Development  Bank and has a  severe  negative
               impact upon  Development  Bank's ability to collect its credit in
               due time and due amount.

          ---  Occurrence of other  instances which might have a negative impact
               upon the  realization of  Development  Bank's  creditor's  rights
               under Comprehensive Agreement 1.

     o    Guaranty Contract 3 is irrevocable and independently effective.EXHIBIT 10.33

Summary of Guaranty  Contract of Maximum Amount  Guarantee signed by and between
Li Xiangqian and Development Bank dated as of April 28, 2005 ("Guaranty Contract
4").

     o    Contract number: Shenfa Longgang Ebao Zi NO.20050407001.

     o    As   guarantor,   Mr.  Li  undertakes  to  assume  joint  and  several
          responsibilities   for  the   indebtedness   of  the   Company   under
          Comprehensive Agreement 1 which include the loan principal,  interest,
          penalty  interest,  expenses for the Lender to realize its  creditor's
          rights  and  maximum  amount  for loan  principal  secured  is RMB 150
          million.

     o    Guaranty period under Guaranty Contract 4 starts from the signing date
          of Guaranty  Contract 4 and ends in two years time from expiry of each
          credit facility used under Comprehensive Agreement 1.

     o    Guaranty Contract 4 is irrevocable and independently effective.

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