P10 Industries (PIOE) 10-Q 2003 Q2 Quarterly report

Exhibit 99.4

Exhibit 32.2—CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Active Power, Inc. (the “Company”) on Form 10-Q for the period ending June 30, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David S. Gino, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C.ss. 1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

/s/ David S. Gino

David S. Gino

Vice President, Chief Operating Officer

and Chief Financial Officer

July 24, 2003