Proposal to establish harmonised methods for in-vehicle battery durability of electrified heavy-duty vehicles:

• Establish harmonised methods for determining in-vehicle battery durability of electrified heavy-duty vehicles (categories 1-2 and 2 with technically permissible maximum laden mass exceeding 3,855 kg) that are pure electric or off-vehicle charging hybrid electric vehicles,
• Require manufacturers to install and maintain State-of-Certified Energy (SOCE) monitors throughout vehicle lifetime at resolution of at least 1 part in 100, making values available via on-board diagnostics port and optionally over-the-air,
• For Contracting Parties electing to enforce minimum performance requirements from optional Annex 4, require manufacturers to ensure compliance through in-use verification comprising Part A (monitor accuracy verification through measured usable battery energy testing via driving on test track/road or bidirectional power supply system, with statistical pass/fail criteria) and Part B (battery durability verification through remote data collection from vehicle sample of minimum 500 vehicles annually, requiring at least 90 per cent of monitored values above applicable minimum performance requirement or declared performance requirement),
• Reserve Part C verification of virtual distance accuracy for future amendment,
• Specify minimum performance requirements with SOCE retention percentages (45-70 per cent) at defined time and distance combinations varying by vehicle category and mass, to be monitored during phase 1 for potential future revision based on energy throughput data.