This document describes the methods for testing electrical characteristics of electric double-layer capacitor cells (hereinafter referred to as capacitor) to be used for peak power assistance in hybrid electric vehicles. All the tests in this document are type tests. NOTE 1 This document can also be applicable to the capacitor used in idling reduction systems (start-and-stop systems) for the vehicles. NOTE 2 This document can also be applicable to the capacitor modules consisting of more than one cell.