Document:

Exhibit 4.1

AMENDMENT NO. 2 TO AMENDMENT AGREEMENT
AND WAIVER

This AMENDMENT
NO. 2 TO AMENDMENT AGREEMENT AND WAIVER (this “Amendment”), dated as of February 27, 2019, is made by and
between Ener-Core, Inc., a Delaware corporation, with headquarters located at 30100 Town Center Dr., Suite O-209, Laguna Niguel,
California 92677 (the “Company”), and the investor listed on the signature page attached hereto (the “Holder”).

RECITALS

A.                
Reference is made to that certain Securities Purchase Agreement dated as of April 22, 2015, by and among the Company, the
Holder (if applicable) and the other investors (the “April 2015 Other Holders”) listed on the signature pages
attached thereto (the “April 2015 SPA”) and, if applicable, the Senior Secured Notes issued to the Holder pursuant
thereto, as amended and restated on December 2, 2016 pursuant to certain amendment agreements (as amended from time to time prior
to the date hereof, the “April 2015 Notes”);

B.                 
Reference is made to that certain Securities Purchase Agreement dated as of May 7, 2015, by and among the Company, the Holder
(if applicable) and the other investors (the “May 2015 Other Holders” and together with the April 2015 Other
Holders, the “Other Holders” and together with the Holder, the “Holders”) listed on the signature
pages attached thereto (the “May 2015 SPA” and together with the April 2015 SPA, individually, an “SPA”
and collectively, the “SPAs”), and, if applicable, the Senior Secured Notes issued to the Holder pursuant thereto,
as amended and restated on December 2, 2016 pursuant to certain amendment agreements (as amended from time to time prior to the
date hereof, the “May 2015 Notes” and together with the April 2015 Notes, the “2015 Notes”);

C.                 
Reference is made to that certain Amendment Agreement and Waiver dated as of December 31, 2018 by and among the Company
and the Holder with respect to the 2015 Notes and the SPAs (the "December Amendment"); and

D.    
In compliance with Section 15 of the 2015 Notes and the SPAs, this Amendment shall only be effective upon the execution
and delivery of this Amendment and agreements in form and substance identical to this Amendment (other than with respect to the
identity of the Holder and any provision regarding the reimbursement of legal fees) (the “Other Agreements”
and together with this Amendment, the “Amendments”) by Other Holders of the 2015 Notes (each an “Other
Holder”) representing on the Closing Date at least the Required Holders (as defined in each of the 2015 Notes) (such
time, the “Effective Time”).

AGREEMENT

NOW THEREFORE,
in consideration of the foregoing mutual premises and the covenants and agreements hereinafter set forth, and for other good and
valuable consideration, the receipt, and legal adequacy of which is hereby acknowledged, the parties hereto, intending to be legally
bound, hereby agree as follows:

    	 		 

     

    

 

ARTICLE I

AMENDMENT

1.                  
Amendment of December Amendment. All references to the date "January 31,
2019" set forth in the December Amendment are hereby amended to instead refer to the date "March 31, 2019", and
all references to the date "February 1, 2019" set forth in the December Amendment are hereby amended to instead refer
to the date "April 1, 2019". Capitalized terms used herein and not otherwise defined herein shall have the respective
meanings set forth in the December Amendment.

article
II

MISCELLANEOUS

 

1.                  
Effect of this Amendment. This Amendment shall form a part of the 2015 Notes and SPAs for all purposes, and each
holder of 2015 Notes and each party to the SPAs shall be bound hereby. This Amendment shall only be deemed to be in full force
and effect from and after both the execution of this Amendment by the parties hereto and the execution of Amendments substantially
identical to this Amendment by the Company and “Holders” holding at least a majority of the aggregate principal amount
of the 2015 Notes outstanding, including the Lead Investor, as well as the Collateral Agent, that, together with undersigned, constitute
the Required Holders under each of the 2015 Notes and SPAs. From and after such effectiveness, any reference to the 2015 Notes
and the SPAs shall be deemed to be a reference to the 2015 Notes and SPAs, as amended hereby. Except as specifically amended as
set forth herein, each term and condition of the 2015 Notes and SPAs shall continue in full force and effect.

 

2.                  
Entire Agreement. This Amendment, together with the SPAs and 2015 Notes, as amended and/or amended and restated to
date, contains the entire agreement of the parties with respect to the matters contemplated hereby and thereby, and supersedes
any prior or contemporaneous written or oral agreements between them concerning the subject matter of this Amendment.

 

3.                  
Governing Law. This Amendment shall be governed by the internal law of the State of New York.

 

4.                  
Counterparts. This Amendment may be executed in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall
constitute but one and the same instrument; signature pages may be detached from multiple separate counterparts and attached to
a single counterpart so that all signature pages are physically attached to the same document. This Amendment may be executed by
fax or electronic mail, in PDF format, and no party hereto may contest this Amendment’s validity solely because a signature
was faxed or otherwise sent electronically.

 

[Signature Page
Follows]

    	 	2	 

     

    

IN WITNESS WHEREOF,
the Holder and the Company have caused their respective signature pages to this Amendment to be duly executed as of the date first
written above. 

	 	COMPANY:
	 	 
	 	ENER-CORE, INC.
	 	 
	 	By: 	
	 	 	Name: Domonic J. Carney

Title: Chief Financial Officer

 

 

 

 

Signature
Page to amendment no. 2 to Amendment Agreement and Waiver—2015 Notes

    	 	3	 

     

    

 

IN WITNESS WHEREOF,
the Holder and the Company have caused their respective signature pages to this Amendment to be duly executed as of the date first
written above.

 

	 	HOLDER:
	 	 
	 	By: 	
	 	 	Name:
Title:

 

Signature
Page to amendment no. 2 to Amendment Agreement and Waiver—2015 Notes

4Exhibit 4.2

 

AMENDMENT
NO. 2 TO AMENDMENT AGREEMENT AND WAIVER

 

This
AMENDMENT NO. 2 TO AMENDMENT AGREEMENT AND WAIVER (the “Amendment”), dated as of February 27, 2019,
is made by and between Ener-Core, Inc., a Delaware corporation, with headquarters located at 30100 Town Center Dr., Suite O-209,
Laguna Niguel, California 92677 (the “Company”), and the investor listed on the signature page attached
hereto (the “Holder”).

 

RECITALS

 

A. Reference
is made to that certain Securities Purchase Agreement dated as of November 23, 2016, by and among the Company, the Holder and
the other investors listed on the signature pages attached thereto and party to a joinder agreement thereto (the “November
2016 SPA”); and the Senior Secured Notes issued to the Holder pursuant thereto (as amended from time to time prior to
the date hereof, the “November 2016 Notes”);

 

B. Reference
is made to that certain Amendment Agreement and Waiver dated as of December 31, 2018 by and among the Company and the Holder with
respect to the November 2016 SPA and the December 2016 Notes (the “December Amendment”); and

 

C. In
compliance with Section 15 of the November 2016 Notes and the November 2016 SPA, this Amendment shall only be effective upon the
execution and delivery of this Amendment and agreements in form and substance identical to this Amendment (other than with respect
to the identity of the Holder and any provision regarding the reimbursement of legal fees) (together with this Amendment, the
“Amendments”) by other holders of the November 2016 Notes representing at least the Required Holders (as defined
in each of the November 2016 Notes) (such time, the “Effective Time”).

 

AGREEMENT

 

NOW
THEREFORE, in consideration of the foregoing mutual premises and the covenants and agreements hereinafter set forth, and for
other good and valuable consideration, the receipt, and legal adequacy of which is hereby acknowledged, the parties hereto, intending
to be legally bound, hereby agree as follows:

 

ARTICLE
I

AMENDMENT

 

1. Amendment
of December Amendment. All references to the date “January 31, 2019” set forth in the December Amendment are hereby
amended to instead refer to the date “March 31, 2019”, and all references to the date “February 1, 2019” set
forth in the December Amendment are hereby amended to instead refer to the date “April 1, 2019”. Capitalized terms used
herein and not otherwise defined herein shall have the respective meanings set forth in the December Amendment.

  

     

     

    

 

ARTICLE
II

MISCELLANEOUS

 

1. Effect
of this Amendment. This Amendment shall form a part of the November 2016 Notes for all purposes, and each holder of November
2016 Notes shall be bound hereby. This Amendment shall only be deemed to be in full force and effect from and after both the execution
of this Amendment by the parties hereto and the execution of Amendments substantially identical to this Amendment by the Company
and “Holders” holding at least a majority of the aggregate principal amount of the November 2016 Notes outstanding,
including the Lead Investor, as well as the Collateral Agent, that, together with undersigned, constitute the Required Holders.
From and after such effectiveness, any reference to the November 2016 Notes shall be deemed to be a reference to the November
2016 Notes, as amended hereby. Except as specifically amended as set forth herein, each term and condition of the November 2016
Notes shall continue in full force and effect.

 

2. Entire
Agreement. This Amendment, together with the November 2016 SPA and November 2016 Notes, as amended to date, contains the entire
agreement of the parties with respect to the matters contemplated hereby and thereby, and supersedes any prior or contemporaneous
written or oral agreements between them concerning the subject matter of this Amendment.

 

3. Governing
Law. This Amendment shall be governed by the internal law of the State of New York.

 

4. Counterparts.
This Amendment may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of
which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one
and the same instrument; signature pages may be detached from multiple separate counterparts and attached to a single counterpart
so that all signature pages are physically attached to the same document. This Amendment may be executed by fax or electronic
mail, in PDF format, and no party hereto may contest this Amendment’s validity solely because a signature was faxed or otherwise
sent electronically.

 

[Signature
Page Follows]

  

    2

     

    

 

IN
WITNESS WHEREOF, the Holder and the Company have caused their respective signature pages to this Amendment to be duly executed
as of the date first written above.

  

	 	COMPANY:
	 	 
	 	ENER-CORE,
    INC.
	 	 	 
	 	By:	
	 	 	Name: 	Domonic
    J. Carney
	 	 	Title:  	Chief
    Financial Officer

   

Signature
Page To Amendment No. 2 To Amendment Agreement And Waiver—2016 Notes

     

     

    

 

IN
WITNESS WHEREOF, the Holder and the Company have caused their respective signature pages to this Amendment to be duly executed
as of the date first written above.

  

	 	HOLDER:
	 	 
	 	By:	 
	 		Name:

 

Signature
Page To Amendment No. 2 To Amendment Agreement And Waiver—2016 Notes

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