Exhibit 1
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned persons hereby agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the common stock of Aqua Metals, Inc. and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filing. In evidence thereof each of the undersigned, being duly authorized, hereby execute this Agreement on the date set forth below.
| Date: | May 31, 2016 |
| INTERSTATE EMERGING INVESTMENTS, LLC | ||
| By: Interstate Batteries, Inc., its sole member | ||
| By: | /s/ William McDade | |
| William McDade | ||
| Vice President & Chief Financial Officer | ||
| INTERSTATE BATTERIES, INC. | ||
| By: | /s/ William McDade | |
| William McDade | ||
| Vice President & Chief Financial Officer | ||