The maximum possible vehicle speed in pure electric operating state in the first combined cycle shall be recorded in the test report and in the drivers ' handbook of production vehicles . During this procedure , the electricity balance ( EBi ) of the high voltage battery ( expressed in Ampere hours ) , measured using the procedure specified in Appendix 2 to the Annex 8 of this Regulation , and Dei shall be recorded at the instant when the fuel consuming engine starts and the accumulation of Dei shall be stopped .