Document:

PROMISSORY
      NOTE

    

    

    
      	
              $50,000.00

            	
              December
                13, 2007

            

    

     

    

    FOR
      VALUE
      RECEIVED, Renewal
      Fuels, Inc.,
      a
      Delaware corporation (the "Borrower"), having an office at 1818 North Farwell
      Avenue, Milwaukee, Wisconsin 53202, hereby promises to pay to the order of
      John
      King
      (the
      "Lender"), at the Lender's principal residence located at 9967 Humphrey Road,
      Cincinnati, OH 45242, or at such other place in the continental United States
      as
      the Lender may designate in writing, in lawful money of the United States,
      and
      in immediately available funds, the principal sum of FIFTY THOUSAND DOLLARS
      ($50,000), and to pay interest thereon at an annual rate equal to twelve percent
      (12%) on the later of February 11, 2008 or the date at which all sums owed
      by
      Borrower to Yorkville Advisors, LLC has been repaid by Borrower.

    

    All
      payments made hereunder shall be applied first to interest accrued and second
      to
      payment of the reduction of the outstanding principal. 

    

    This
      Note
      may be prepaid, in whole or in part, at any time, without premium or penalty
      of
      any kind. 

    

    In
      the
      event of a default by the Borrower or in the event any payment of principal
      or
      interest or of principal and interest as the case may be, required to be paid
      by
      this Note is not paid when due, or in the event of any other violation or breach
      of any term, condition, covenant or provision of this Note, the entire remaining
      unpaid principal of this Note and all accrued but unpaid interest thereon shall
      immediately be due and payable at the option of the holder hereof. 

    

    To
      the
      fullest extent permitted by law, Borrower, for itself and its representatives,
      successors and assigns, hereby: (a) waive notice of maturity, demand,
      presentment for payment, diligence in collection, and notice of non-payment
      and
      protest; (b) waive all applicable execution, valuation, and appraisal rights
      with respect to any demand or action on this Note; (c) consent and agree to
      any
      extension of time, whether one or more, for the payment hereof and/or to any
      and
      all renewals hereof; and (d) consent and agree that Holder may release any
      party
      liable for the payment hereof, and otherwise amend this Note, and that any
      such
      extension, release, or amendment may be without notice to and without
      discharging or effecting the liability of any party liable
      hereunder.

    

    Borrower,
      for itself and its representatives, successors and assigns, hereby agrees that
      if this Note is placed in the hands of an attorney for collection or to defend
      or enforce any of the rights of Holder, then Borrower shall be obligated to
      pay,
      in addition to any and all costs and disbursement otherwise allowed, all costs
      and expenses, including, but not limited to reasonable attorney’s fees incurred
      by Holder in connection therewith, whether or not suit is filed.

    

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    If
      any
      term, covenant or condition of this Note or the application thereof to any
      person or circumstance shall, to any extent, be invalid or unenforceable, then
      the remainder of this Note, or the application of such term, covenant or
      condition to persons or circumstances other than those as to which it is held
      invalid or unenforceable shall not be affected thereby. Each term, covenant,
      and
      condition of this Note shall be valid and enforceable to the fullest extent
      permitted by law. This Note shall be governed, in all respects, by the internal
      laws of the State of New York.

    

    IN
      WITNESS WHEREOF, Borrower has caused this Note to be duly executed as of the
      day
      and year first above written.

    

    

    RENEWAL
      FUELS, INC.

    

    

    By: /s/
      John
      King                            

    Name:
      John King

    Title:
      CEO & CFOPROMISSORY
      NOTE

    

    

    
      	
              $50,000.00

            	
              December
                13, 2007 

            

    

    

    FOR
      VALUE
      RECEIVED, Renewal
      Fuels, Inc.,
      a
      Delaware corporation (the "Borrower"), having an office at 1818 North Farwell
      Avenue, Milwaukee, Wisconsin 53202, hereby promises to pay to the order of
      Rudolf
      A. Wiedemann
      (the
      "Lender"), at the Lender's principal residence located at 572 Echo Ridge Court,
      Reno, NV 89511, or at such other place in the continental United States as
      the
      Lender may designate in writing, in lawful money of the United States, and
      in
      immediately available funds, the principal sum of FIFTY THOUSAND DOLLARS
      ($50,000), and to pay interest thereon at an annual rate equal to twelve percent
      (12%) on the later of February 11, 2008 or the date at which all sums owed
      by
      Borrower to Yorkville Advisors, LLC has been repaid by Borrower.

    

    All
      payments made hereunder shall be applied first to interest accrued and second
      to
      payment of the reduction of the outstanding principal. 

    

    This
      Note
      may be prepaid, in whole or in part, at any time, without premium or penalty
      of
      any kind. 

    

    In
      the
      event of a default by the Borrower or in the event any payment of principal
      or
      interest or of principal and interest as the case may be, required to be paid
      by
      this Note is not paid when due, or in the event of any other violation or breach
      of any term, condition, covenant or provision of this Note, the entire remaining
      unpaid principal of this Note and all accrued but unpaid interest thereon shall
      immediately be due and payable at the option of the holder hereof. 

    

    To
      the
      fullest extent permitted by law, Borrower, for itself and its representatives,
      successors and assigns, hereby: (a) waive notice of maturity, demand,
      presentment for payment, diligence in collection, and notice of non-payment
      and
      protest; (b) waive all applicable execution, valuation, and appraisal rights
      with respect to any demand or action on this Note; (c) consent and agree to
      any
      extension of time, whether one or more, for the payment hereof and/or to any
      and
      all renewals hereof; and (d) consent and agree that Holder may release any
      party
      liable for the payment hereof, and otherwise amend this Note, and that any
      such
      extension, release, or amendment may be without notice to and without
      discharging or effecting the liability of any party liable
      hereunder.

    

    Borrower,
      for itself and its representatives, successors and assigns, hereby agrees that
      if this Note is placed in the hands of an attorney for collection or to defend
      or enforce any of the rights of Holder, then Borrower shall be obligated to
      pay,
      in addition to any and all costs and disbursement otherwise allowed, all costs
      and expenses, including, but not limited to reasonable attorney’s fees incurred
      by Holder in connection therewith, whether or not suit is filed.

    

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    If
      any
      term, covenant or condition of this Note or the application thereof to any
      person or circumstance shall, to any extent, be invalid or unenforceable, then
      the remainder of this Note, or the application of such term, covenant or
      condition to persons or circumstances other than those as to which it is held
      invalid or unenforceable shall not be affected thereby. Each term, covenant,
      and
      condition of this Note shall be valid and enforceable to the fullest extent
      permitted by law. This Note shall be governed, in all respects, by the internal
      laws of the State of New York.

    

    IN
      WITNESS WHEREOF, Borrower has caused this Note to be duly executed as of the
      day
      and year first above written.

    

    

    RENEWAL
      FUELS, INC.

    

    

    By:  
      /s/
      John
      King                                

    Name:
      John King

    Title:
      CEO & CFOUnassociated Document

    December
      31, 2007

    

    

    Renewal
      Fuels Inc.

    1818
      North Farwell Avenue

    Milwaukee,
      WI 53202

    Attention:     
      John
      King

    

    

    Dear
      Mr.
      King:

    

    This
      letter will memorialize our agreement between Renewal Fuels Inc. (f/k/a Tech
      Laboratories, Inc.) (the “Company”)
      and YA
      Global Investments, L.P. (f/k/a Cornell Capital Partners, L.P.) (“YA
      Global”)
      wherein YA Global has agreed to fund Three Hundred Thousand Dollars ($300,000)
      of the Second Closing (the “Second
      Closing”)
      pursuant to and as defined in the Securities Purchase Agreement dated on or
      about July 2, 2007 by and between the parties (the “Securities
      Purchase Agreement”).
      

    

    In
      connection with the partial funding agreed to herein, the Company represents
      and
      warrants to YA Global that management of the Company has on the date hereof
      loaned to the Company One Hundred Fifty Thousand Dollars ($150,000) on terms
      which are acceptable to YA Global and pursuant to the documents presented to
      YA
      Global and attached hereto. 

    

    The
      parties hereby agree to add a new Section 3(ee) to the Securities Purchase
      Agreement that states: 

    

    (ee)
      the
      Company represents and warrant to YA Global that management of the Company
      has
      as of the date hereof loaned to the Company One Hundred Fifty Thousand Dollars
      ($150,000) on terms which are acceptable to YA Global (the “Management
      Loan”)
      and
      pursuant to the documents presented to YA Global. 

    

    This
      agreement in lieu of a formal amendment and restatement of the Securities
      Purchase Agreement shall be deemed to have added this Section 3(ee) to the
      Securities Purchase Agreement. 

    

    In
      connection with the partial funding agreed to herein the Company acknowledges
      that all the conditions precedent to the Second Closing outlined in Section
      7(b)
      of the Securities Purchase Agreement must be satisfied, except for condition
      7(b)(iv) and the newly added 7(b)(x). 

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    The
      parties hereby agree to add a new section 7(b)(x) to the Securities Purchase
      Agreement which states: 

    

    (x)  The
      Company shall have signed a definitive joint venture with Eco Plantations.
      

    

    This
      agreement is in lieu of a formal amendment and restatement of the Securities
      Purchase Agreement shall be deemed to have added this Section 7(b)(x) to the
      Securities Purchase Agreement. 

    

    

    In
      connection with the Management Loan the Company covenants to YA Global as long
      as the all debentures issued by the Company to YA Global are outstanding that
      the Management Loan will not be repaid to management without the express written
      consent of YA Global.

    

    The
      parties hereby agree to add a new section 4(u) to the Securities Purchase
      Agreement which states: 

    

    (u) In
      connection with the Management Loan outlined in Section 3 (ee) herein the
      Company covenants to YA Global as long as the all debentures issued by the
      Company to YA Global are outstanding that the Management Loan will not be repaid
      to management without the express written consent of YA Global.

    

    

    In
      connection with the partial funding agreed to herein the Company covenants
      to YA
      Global that such requirement 7(b)(iv) and newly added Section 7(b)(x) of the
      Second Closing contained in the Securities Purchase Agreement will be satisfied
      no later than than January 31, 2008 (the “Condition
      Deadline”).
      

    

    

    The
      parties hereby agree to add a new section 4(v) to the Securities Purchase
      Agreement which states: 

    

    (v) The
      Company shall satisfy the requirements outlined in 7(b)(iv) and newly added
      Section 7(b)(x) of the Second Closing contained herein no later than January
      31,
      2008 (the “Condition
      Deadline”).
      

    

    The
      parties hereby agree to add a new section 4(w) to the Securities Purchase
      Agreement which states: 

     

    (w) The
      Company shall have unconditionally booked and received at least a 50% deposit
      for the sale of at least one BioDiesel Master Unit no later than January 31,
      2008. 

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    

    This
      agreement is in lieu of a formal amendment and restatement of the Securities
      Purchase Agreement shall be deemed to have added this Section 4(v) to the
      Securities Purchase Agreement. 

    

    

    The
      parties hereby agree to add a new section 4(x) to
      the
      Securities Purchase Agreement which
      shall state: 

    

    (x)
      The
      Company shall have signed a definitive joint venture with Eco
      Plantations no
      later
      than January 31, 2008. 

    

    This
      agreement is in lieu of a formal amendment and restatement of the Securities
      Purchase Agreement shall be deemed to have added this Section 4(u), Section
      4(v), Section 4(w) and Section 4(x) respectively to the Securities Purchase
      Agreement. 

    

    Notwithstanding
      the partial closing shall in no way be a waiver of conditions set forth in
      Section 7(b)(iv) or the newly added Section 7(b)(x) to the Securities Purchase
      Agreement required for the full funding of the Second Closing to which the
      Company shall not be entitled until these conditions are met. 

    

    Furthermore
      YA Global also agrees to suspend conversions under the Convertible Debentures
      issued under the Securities Purchase Agreement until February 15, 2008 (the
      “Conversion
      Restriction”).

    

    In
      the
      event that such covenants contained in Section 4(u) and (v), as added herein,
      to
      the Securities Purchase Agreement are not met by the Condition Deadline and
      the
      partial funding contemplated herein has been consummated it shall be deemed
      an
      Event of Default, as defined in and, under the Securities Purchase Agreement,
      the Convertible Debentures issued there under and all other agreement entered
      into in connection therewith (the “Transaction
      Documents”),
      YA
      Global shall therefore be entitled to any and all remedies under the Transaction
      Documents, and YA Global shall no longer be subject to the Conversion
      Restriction. 

    

    Furthermore,
      as a result of the agreement to partially fund the Company has agreed
      to:

    

    
      	1)  	
              Reduce
                the warrant exercise price on Warrant No.TCHL-1-1 issued to YA Global
                on
                April 20, 2007 to $0.001 per share.

            

    

    
      	2)  	
              Reduce
                the warrant exercise price on 1,200,000 of the shares of the Company’s
                Common Stock issuable under Warrant No. TLBT-5-1 issued to YA Global
                on or
                about July 2, 2007 to $0.001 per share.

            

    

    

    

    [SIGNATURE
      PAGE TO FOLLOW]

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    
 

    
      	
              RENEWAL
                FUELS Inc. 

            	 	
              YA
                GLOBAL INVESTMENTS, L.P.

            
	 	 	 
	
              By:
                /s/
                John King    

            	 	
              By:
                Yorkville Advisors, LLC

            
	
              Name: 
                John King

            	 	
              Its:
                Investment Manager

            
	
              Title:   
                President

            	 	 
	 	 	
              By:
                /s/
                Mark Angelo

            
	 	 	
              Name:
                Mark Angelo

            
	 	 	
              Title:  
                President and Portfolio
                Manager

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