This standard specifies requirements for limitation of electrolyte spillage@ retention of propulsion batteries during a crash@ and electrical isolation of the chassis from the highvoltage system@ to be met by vehicles that use electricity as propulsion power . Purpose. The purpose of this standard is to reduce deaths and injuries during a crash which occur because of electrolyte spillage from propulsion batteries@ intrusion of propulsion battery system components into the occupant compartment@ and electrical shock.