29. GRSP resumed discussion on the approval of the replacement units of removable Rechargeable Electric Energy Storage System (REESS), on the basis of feedback from contracting parties and from the informal working group on UN GTR No. 20 (Electric Vehicle Safety). GRSP expected information from contracting parties on whether the approval of removable REESS also covers the replacement units. Moreover, GRSP expected an analysis coordinated by the experts from Italy, IMMA and other stakeholders on verifying the need for a separate UN Regulation specifically dedicated to REESS replacement units.