Brief: As the on-demand mobility ecosystem continues to evolve, the trend of changing from oil to electricity in the choice of means of travel is subsequently increasing significantly, and the choice of alternative transportation devices such as electric scooters, electric bicycles and electric mopeds will become one of the preferred options for future travel. The associated electrical safety of the entire vehicle and the battery energy storage system are also receiving increasing attention. UN ECE R136 regulation was updated on January 4, 2023 regarding the test methods and requirements for electrical safety and rechargeable electrical energy storage systems for Class L vehicles.

Part I: Safety requirements with respect to the electric power train of vehicles of category L1 with a maximum design speed exceeding 6 km/h, equipped with an electric power train, excluding vehicles permanently connected to the grid. 

Part II: Safety requirements with respect to the Rechargeable Electrical Energy Storage System (REESS) of vehicles of category L with a maximum design speed exceeding 6 km/h, equipped with an electric power train, excluding vehicles permanently connected to the grid. 

The following section will focus on the part II Approval of a Rechargeable Electrical Energy Storage System (REESS).

1. Vibration
2. Thermal shock and cycling
3. Drop test
4. Mechanical Impact
5. Fire resistance
6. External short circuit protection
7. Over-charge protection
8. Over-discharge protection
9. Over-temperature protection
10. Over-current protection （new）

1.Update test conditions of tests 1-9;

2.Increase the overcurrent test;

3.Provide documents of REESS related to low-temperature protection;

4.Provide documents of REESS related to thermal propagation.

"Type of REESS" means systems which do not differ significantly in such essential aspects as:

1. The manufacturer's trade name or mark;

2. The chemistry, capacity and physical dimensions of its cells;

3. The number of cells, the mode of connection of the cells and the physical support of the cells;

4. The construction, materials and physical dimensions of the casing; and

5. The necessary ancillary devices for physical support, thermal management and electronic control.

4 REESS samples

Power cord

Signal cord and program

1. InformationDocument.

2. Factory audit. (ISO 9001 or IATF 16949 certificate can be exempted factory audit)

3. Testing.

4. Approval.

5. Issue certificates.

As from 1 September 2025, Contracting Parties applying this Regulation shall not be obliged to accept type approvals to the preceding series of amendments, first issued after 1 September 2025.;

Until 1 September 2027, Contracting Parties applying this Regulation shall accept type approvals to the preceding series of amendments, first issued before 1 September 2025;

As from 1 September 2027, Contracting Parties applying this Regulation shall not be obliged to accept type approvals issued to the preceding series of amendments to this Regulation.

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