In the context of today’s globalized trade, the explosive growth of lithium – battery applications has made the importance of battery UN numbers even more prominent. From common consumer electronic devices such as smartphones and tablets to emerging electric vehicles and energy – storage systems, lithium batteries are everywhere. However, their wide – spread application has also brought a series of transportation safety issues, and the accurate use of battery UN numbers has become the key to solving these problems.
In recent years, safety accidents such as fires and explosions of goods caused by lithium – battery transportation have occurred from time to time. Behind these accidents, there is often a close relationship with the incorrect use or neglect of battery UN numbers, which has brought huge losses and risks to the logistics industry and related enterprises.
To effectively address these risks, the United Nations and relevant national agencies have been constantly working to refine and improve the regulations on battery transportation. In 2025, the battery UN number system has undergone an important update and expansion. This change is undoubtedly important information that cross – border e – commerce players, foreign trade practitioners, battery manufacturers, and logistics personnel need to pay high attention to. Understanding and mastering these new regulations, especially the correct application of battery UN numbers, is a prerequisite for safe and compliant battery trade.
The core of the new regulations this time is that instead of simply assigning a fixed UN number to a product, the classification is based on the chemical type, packaging state, and product form of the battery, ensuring more precise identification and management of risks during battery transportation, and allowing battery UN numbers to truly play their due role.
1. Basics: Understanding the “Dangerous Identity” of Batteries
1.1 What is a battery UN number?
A battery UN number, short for United Nations number for the transport of dangerous goods, is a 4 – digit “identity card” established by the United Nations to identify dangerous goods. This number is universal globally and enables the rapid identification of dangerous goods. Whether in road, sea, or air transportation, transportation departments, customs, and relevant regulatory agencies in various countries can quickly understand the dangerous nature of goods through the battery UN number.
The importance of battery UN numbers is self – evident. It directly determines the packaging requirements, required documentation, labeling, and applicable transportation modes of goods. Incorrect use of battery UN numbers may lead to various problems during transportation, such as refusal of transportation, delivery delays, high fines, and even serious safety accidents. For example, mislabeling goods with a higher risk level with a UN number for a lower – risk category may result in insufficient protective measures during transportation, thereby increasing the risk of accidents.
1.2 Which category of dangerous goods do batteries belong to?
In the United Nations classification system for dangerous goods, batteries are mainly classified as Class 9 – Miscellaneous dangerous substances and articles. Goods in this category usually have some special dangerous properties but do not belong to other specific categories of dangerous goods. However, batteries of different chemical types may have more specific classifications. For example, lead – acid batteries are classified as Class 8 – Corrosive substances due to their corrosiveness. Understanding the specific classification of batteries is crucial for correctly selecting battery UN numbers and taking appropriate transportation measures.
2. Core: The Complete Picture of the Latest Battery UN Numbers in 2025
2.1 Consumer Electronics and General Industrial Batteries (Based on Chemical Type and Packaging State)
To present the UN numbers of batteries under different chemical types and packaging states more clearly, we sort them out according to the matrix distribution of “chemical type x packaging state”.
| Chemical Type | Transported Alone | Packed with Equipment/Installed in Equipment |
|---|---|---|
| Lithium – ion Batteries | UN 3480 | UN 3481 |
| Lithium – metal Batteries | UN 3090 | UN 3091 |
| Sodium – ion Batteries | UN 3551 | UN 3552 |
| Nickel – metal Hydride/Nickel – cadmium, etc. | UN 3496 | (Usually included in this category) |
| Lead – acid Batteries (Wet) | UN 2794 | (Usually included in this category) |
Each battery UN number corresponds to a specific battery type and transportation requirements. Take lithium – ion batteries as an example. UN 3480 is applicable to lithium – ion batteries transported alone. Lithium – ion batteries have high energy density and long service life and are widely used in various consumer electronic devices. However, due to the characteristics of their internal chemical substances, they may cause short – circuits, fires, or even explosions if subjected to extrusion, collision, or overheating during transportation. Therefore, when transporting with this battery UN number, strict requirements are imposed on packaging and transportation conditions.
2.2 Batteries for Vehicles and Large – scale Devices (Based on Product Form)
In the case of batteries for vehicles and large – scale devices, there is a key update in the 2025 regulations. UN 3171 (Battery – powered vehicles) has been phased out. The following are the latest battery UN numbers sorted out according to product form and different chemical driving types:
| Product Form | Lithium – ion Driven | Lithium – metal Driven | Sodium – ion Driven |
|---|---|---|---|
| Vehicles (e.g., electric vehicles, scooters) | UN 3556 | UN 3557 | UN 3558 |
| Batteries in Large – scale Freight Units (e.g., energy – storage container battery packs) | UN 3536 | UN 3563 | UN 3564 |
These new battery UN numbers reflect the precise management of the transportation of batteries in different forms by the new regulations. For example, UN 3556 is applicable to vehicles driven by lithium – ion batteries, such as electric vehicles and scooters. During transportation, the batteries in these vehicles are in a relatively fixed position. However, due to the large volume of the vehicles, they may be affected by bumps and collisions during transportation. Therefore, when transporting with this battery UN number, it is necessary to fix and protect the vehicles to ensure the safety of the batteries.
2.3 Special Cases and Exemptions
In addition to the common battery types and product forms mentioned above, there are also some special cases that need special attention. Ordinary dry batteries that meet specific standards, such as alkaline batteries and zinc – carbon batteries, are generally not classified as dangerous goods. This is because the chemical properties of these batteries are relatively stable, and the possibility of causing danger during normal transportation is low.
Waste batteries also have independent battery UN numbers. For example, the battery UN number for waste lead – acid batteries is UN 2800. This is to ensure the safety of waste batteries during transportation and disposal through specialized management. Waste lead – acid batteries contain harmful substances such as lead and sulfuric acid. If not properly disposed of, they can cause serious environmental pollution. Therefore, when transporting with this battery UN number, strict environmental protection and safety requirements must be followed.
For mixed battery packs, since they contain multiple different chemical types of batteries, the situation is more complex. Such battery packs need to be tested and classified according to the strictest requirements to determine their accurate battery UN numbers. This is to prevent potential safety hazards during transportation due to insufficient risk assessment of mixed battery packs.
3. Practice: Key Steps from Numbering to Transportation
3.1 Step 1: The Correct Process for Determining Battery UN Numbers
To accurately determine the battery UN number, a clear process needs to be followed. First, identify the chemical type of the battery, which is the most basic step. Batteries of different chemical types have different dangerous properties, so the chemical type is an important basis for determining the battery UN number. Then, judge the packaging state of the battery, whether it is transported alone or packed with equipment or installed in equipment.
Next, confirm the product form, such as whether it is an ordinary consumer – electronic battery, a vehicle battery, or a large – scale device battery. Finally, based on the above information, lock in the unique battery UN number. This process is like a precise navigation system, helping enterprises and logistics personnel accurately find the corresponding battery UN number for the battery.
3.2 Step 2: Meeting the Prerequisite – UN38.3 Test
The UN38.3 test is a mandatory safety test for almost all lithium/sodium batteries transported by air. It complements the battery UN number but is essentially different. The battery UN number is mainly used to identify the dangerous nature and classification of the battery, while the UN38.3 test is an actual safety test of the battery.
This test includes multiple items such as altitude simulation, thermal testing, vibration, and shock, aiming to ensure that the battery can withstand various environmental conditions during air transportation without causing fires, explosions, or other dangerous situations. Only batteries that have passed the UN38.3 test are eligible for air transportation, and the corresponding battery UN number should be correctly used for transportation.
3.3 Step 3: Complying with the Latest Packaging and Labeling Requirements (Key Points in 2025)
Packaging Requirements
In terms of packaging, UN – standard packaging must be used. This is the basic requirement to ensure the safety of batteries during transportation. The 2025 regulations also add some new requirements. The packaging of some lithium/sodium batteries must pass the 3 – meter stacking test. This test is to simulate the pressure and weight that the battery may bear during transportation, ensuring that the packaging remains intact in a stacked state and preventing the battery from being damaged. At the same time, correctly marking the battery UN number is also an important part of the packaging, which can help transportation personnel and regulatory agencies quickly identify the nature of the goods.
In addition, the new regulations also have strict restrictions on the battery’s charge level. The charge level of lithium – ion batteries (UN 3480) transported alone should not exceed 30%. This is to reduce the possibility of danger caused by over – charged batteries during transportation and is also an important guarantee for the correct use of battery UN numbers in transportation.
Labeling Requirements
In terms of labeling, there are also important updates in 2025. The “Lithium – battery label” has been unified and renamed to the more general “Battery label”, which reflects the unified management of different types of batteries in the new regulations. The name of the “Class 9 Dangerous Goods Label” has been updated to the “Class 9 Dangerous Goods Label (Lithium – ion and Sodium – ion Batteries)”.
Although the style remains the same, the scope has been expanded to cover lithium – ion and sodium – ion batteries. In actual operation, it is necessary to ensure that these labels are correctly affixed and correspond to the battery UN number, so that transportation personnel and regulatory agencies can accurately identify the dangerous nature of the goods.
4. Common Misunderstandings and Latest Q&A (2025 Edition)
Q1: Can I still use the battery UN number UN 3171 when shipping an electric scooter?
A1: Absolutely not. Since April 1, 2025 (for air transportation), UN 3556/3557/3558 has mandatory replaced UN 3171. Although the grace period for sea transportation extends until January 1, 2026, it is recommended to switch to the new battery UN number immediately to avoid potential risks and problems.
Q2: Do sodium – ion batteries and lithium – ion batteries use the same battery UN number?
A2: No. The new regulations have assigned exclusive battery UN numbers (3551/3552) to sodium – ion batteries, which must be used separately and cannot be confused. This is because sodium – ion batteries and lithium – ion batteries have different chemical properties and dangerous characteristics, and different battery UN numbers are needed for accurate identification and management.
Q3: As long as I have the battery UN number and the test report, can I use any packaging?
A3: That’s completely wrong. Specified – standard UN packaging must be used, and attention should be paid to the newly added physical – performance requirements such as the 3 – meter stacking test. Even if you have the correct battery UN number and test report, if the packaging does not meet the requirements, safety problems may still occur during transportation.
5. Conclusion: Grasping Safety and Compliance in Change
The refinement of battery UN numbers is an inevitable result of industrial development and safety management. With the continuous progress of battery technology and the expansion of its application scope, the requirements for battery – transportation safety are also getting higher. The 2025 regulations mean more precise risk control and clearer responsibility division. Through more detailed classification and management of batteries, especially the correct use of battery UN numbers, the safety risks during transportation can be effectively reduced, and the safety of personnel and property can be guaranteed.
Looking to the future, as new technologies such as solid – state batteries gradually mature, the regulations on battery transportation will also continue to evolve. Enterprises and relevant practitioners need to maintain a keen sense of awareness, keep up – to – date with regulatory changes, and continuously adjust their operational strategies. Before each transportation, do not rely on experience. Be sure to consult the latest regulations of official agencies such as IATA or seek advice from professional dangerous – goods transportation service providers to ensure trouble – free battery transportation and let battery UN numbers always be a reliable guarantee for safe battery transportation.